chore(deps): bump protobuf from 3.19.6 to 5.29.6 in /music2grid in the uv group across 1 directory

[dependabot]

Bumps the uv group with 1 update in the /music2grid directory: protobuf.

Updates protobuf from 3.19.6 to 5.29.6

Release notes

Sourced from protobuf's releases.

Protocol Buffers v3.20.3

Java

• Refactoring java full runtime to reuse sub-message builders and prepare to migrate parsing logic from parse constructor to builder.
• Move proto wireformat parsing functionality from the private "parsing constructor" to the Builder class.
• Change the Lite runtime to prefer merging from the wireformat into mutable messages rather than building up a new immutable object before merging. This way results in fewer allocations and copy operations.
• Make message-type extensions merge from wire-format instead of building up instances and merging afterwards. This has much better performance.
• Fix TextFormat parser to build up recurring (but supposedly not repeated) sub-messages directly from text rather than building a new sub-message and merging the fully formed message into the existing field.
• This release addresses a Security Advisory for Java users

Commits

• See full diff in compare view

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[socialawy]

⚠️ Review Note — Major Version Jump (protobuf 3→5)

This is a 2-major-version jump. Protobuf 4+ has significant API changes:

• New Python module structure
• Removed deprecated APIs
• Different message class hierarchy

Recommendation: Test the music2grid pipeline thoroughly before merging. Verify all .proto files compile and runtime serialization/deserialization works.