Update dependency protobuf to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
protobuf	5.29.4 -> 6.30.2

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[github-actions]

Test Results

10 files  ±0  10 suites  ±0   5s ⏱️ ±0s
 3 tests ±0   3 ✅ ±0  0 💤 ±0  0 ❌ ±0 
30 runs  ±0  30 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 4e79a8c. ± Comparison against base commit 13e7f3c.

[bkeryan]

This isn't really updating protobuf to v6 because our grpcio-tools version constraint is limiting us to protobuf v4. When we update grpcio-tools, then our codegen will require the corresponding versions of grpcio and protobuf or newer.

[renovate]

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