Update Xamarin.AndroidX.Leanback NuGet versions for 1.2.0 release

[Copilot]

This PR completes the update of Xamarin.AndroidX.Leanback packages to version 1.2.0 by incrementing the NuGet package versions following repository conventions.

Changes Made

Updated NuGet versions in config.json for both Leanback packages:

• androidx.leanback:leanback: NuGet version 1.2.0 → 1.2.0.1
• androidx.leanback:leanback-preference: NuGet version 1.2.0 → 1.2.0.1

Background

The Maven artifact versions were already updated to 1.2.0 in PR #1145 (Weekly Stable Updates). This PR adds the necessary NuGet version increment (revision number) to enable building and publishing new packages following the repository's versioning convention:

• Major.Minor.Patch mirrors the Maven artifact version
• Revision (4th component) is used for NuGet-only updates

Validation

✅ Configuration validation passes
✅ Existing binding customizations preserved (2 Additions, 4 Transforms)
✅ Metadata verification succeeds (dotnet cake --target=metadata-verify)
✅ Package structure follows repository conventions

Ready for Build

The configuration is now ready for the standard build pipeline:

1. dotnet cake --target=binderate - Generate binding projects
2. dotnet cake --target=libs - Build libraries
3. dotnet cake --target=nuget - Generate NuGet packages

Fixes #1152.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• crl.entrust.net
  • Triggering command: /usr/bin/dotnet run --project util/Xamarin.AndroidBinderator/Xamarin.AndroidBinderator.Tool/Xamarin.AndroidBinderator.Tool.csproj -- binderate --config-file /home/REDACTED/work/android-libraries/android-libraries/config.json --base-path /home/REDACTED/work/android-libraries/android-libraries (dns block)
• dl.google.com
  • Triggering command: /home/REDACTED/work/android-libraries/android-libraries/util/Xamarin.AndroidBinderator/Xamarin.AndroidBinderator.Tool/bin/Debug/net8.0/Xamarin.AndroidBinderator.Tool binderate --config-file /home/REDACTED/work/android-libraries/android-libraries/config.json --base-path /home/REDACTED/work/android-libraries/android-libraries (dns block)
• ocsp.entrust.net
  • Triggering command: /usr/bin/dotnet run --project util/Xamarin.AndroidBinderator/Xamarin.AndroidBinderator.Tool/Xamarin.AndroidBinderator.Tool.csproj -- binderate --config-file /home/REDACTED/work/android-libraries/android-libraries/config.json --base-path /home/REDACTED/work/android-libraries/android-libraries (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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