Upgrade nuget package used in benchmark

[prozolic]

This PR upgrades nuget package used in sandbox/Benchmark project.

[Copilot]

Pull request overview

This PR updates the sandbox/Benchmark project to use newer NuGet packages (notably Tomlyn and CsToml), and adjusts benchmark code to align with the updated Tomlyn APIs and new benchmark scenarios.

Changes:

• Upgraded Tomlyn package version and bumped CsToml package references used under the NuGetCsToml configuration.
• Updated Tomlyn benchmark calls to use TomlSerializer APIs, and added a Tomlyn source-generator context for AOT/trimming-friendly benchmarks.
• Added a dedicated CsToml “from UTF-8 bytes” parse benchmark path and changed benchmark run preset from ShortRun to MediumRun.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
sandbox/Benchmark/Program.cs	Updates the debug-time quick run to invoke the new UTF-8 parse benchmark method.
sandbox/Benchmark/Model/Model.cs	Introduces a Tomlyn source-generator context configured for snake_case naming.
sandbox/Benchmark/Config/BenchmarkConfig.cs	Switches benchmark jobs from ShortRun to MediumRun (affects runtime/throughput).
sandbox/Benchmark/Benchmark/ParseBenchmark.cs	Adds cached UTF-8 input and updates Tomlyn parse benchmarks to TomlSerializer.Deserialize.
sandbox/Benchmark/Benchmark/ClassSerializationBenchmark.cs	Adds Tomlyn reflection options and a new source-generator serialization benchmark.
sandbox/Benchmark/Benchmark/ClassDeserializationBenchmark.cs	Adds Tomlyn reflection options and a new source-generator deserialization benchmark.
sandbox/Benchmark/Benchmark.csproj	Upgrades Tomlyn package and updates CsToml package versions used for the NuGet-based benchmark job.

Comments suppressed due to low confidence (13)

sandbox/Benchmark/Benchmark/ParseBenchmark.cs:111

• TomlSerializer.Deserialize() returns a nullable reference; using the null-forgiving operator here can hide parse failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly.

        var table = TomlSerializer.Deserialize<Tomlyn.Model.TomlTable>(tomlUtf16Text)!;

sandbox/Benchmark/Benchmark/ParseBenchmark.cs:163

• TomlSerializer.Deserialize() returns a nullable reference; using the null-forgiving operator here can hide parse failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly. Also, the local name 'document' is misleading since the type is TomlTable.

        var document = TomlSerializer.Deserialize<Tomlyn.Model.TomlTable>(tomlUtf16Text)!;
        return document;

sandbox/Benchmark/Benchmark/ParseBenchmark.cs:217

• TomlSerializer.Deserialize() returns a nullable reference; using the null-forgiving operator here can hide parse failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly.

        var table = TomlSerializer.Deserialize<Tomlyn.Model.TomlTable>(tomlUtf16Text)!;

sandbox/Benchmark/Benchmark/ParseBenchmark.cs:271

• TomlSerializer.Deserialize() returns a nullable reference; using the null-forgiving operator here can hide parse failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly.

        var table = TomlSerializer.Deserialize<Tomlyn.Model.TomlTable>(tomlUtf16Text)!;

sandbox/Benchmark/Benchmark/ParseBenchmark.cs:325

• TomlSerializer.Deserialize() returns a nullable reference; using the null-forgiving operator here can hide parse failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly.

        var table = TomlSerializer.Deserialize<Tomlyn.Model.TomlTable>(tomlUtf16Text)!;

sandbox/Benchmark/Benchmark/ParseBenchmark.cs:376

• TomlSerializer.Deserialize() returns a nullable reference; using the null-forgiving operator here can hide parse failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly.

        var table = TomlSerializer.Deserialize<Tomlyn.Model.TomlTable>(tomlUtf16Text)!;

sandbox/Benchmark/Benchmark/ParseBenchmark.cs:427

• TomlSerializer.Deserialize() returns a nullable reference; using the null-forgiving operator here can hide parse failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly.

        var table = TomlSerializer.Deserialize<Tomlyn.Model.TomlTable>(tomlUtf16Text)!;

sandbox/Benchmark/Benchmark/ParseBenchmark.cs:478

• TomlSerializer.Deserialize() returns a nullable reference; using the null-forgiving operator here can hide parse failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly.

        var table = TomlSerializer.Deserialize<Tomlyn.Model.TomlTable>(tomlUtf16Text)!;

sandbox/Benchmark/Benchmark/ParseBenchmark.cs:532

• TomlSerializer.Deserialize() returns a nullable reference; using the null-forgiving operator here can hide parse failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly.

        var table = TomlSerializer.Deserialize<Tomlyn.Model.TomlTable>(tomlUtf16Text)!;

sandbox/Benchmark/Benchmark/ParseBenchmark.cs:588

• TomlSerializer.Deserialize() returns a nullable reference; using the null-forgiving operator here can hide parse failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly.

        var table = TomlSerializer.Deserialize<Tomlyn.Model.TomlTable>(tomlUtf16Text)!;

sandbox/Benchmark/Benchmark/ParseBenchmark.cs:641

• TomlSerializer.Deserialize() returns a nullable reference; using the null-forgiving operator here can hide parse failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly.

        var table = TomlSerializer.Deserialize<Tomlyn.Model.TomlTable>(tomlUtf16Text)!;

sandbox/Benchmark/Benchmark/ParseBenchmark.cs:693

• TomlSerializer.Deserialize() returns a nullable reference; using the null-forgiving operator here can hide parse failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly.

        var table = TomlSerializer.Deserialize<Tomlyn.Model.TomlTable>(tomlUtf16Text)!;

sandbox/Benchmark/Benchmark/ClassDeserializationBenchmark.cs:105

• TomlSerializer.Deserialize(...) returns a nullable reference; using the null-forgiving operator here can hide failures and can result in returning null from a method that declares a non-null return type. Prefer throwing (or otherwise handling) the null case explicitly.

        var obj = TomlSerializer.Deserialize(tomlUtf16TextInSnakeCase, TomlynContext.Default.TestTomlSerializedObjectInSnakeCase)!; // Tomlyn (source generator)

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