chore(deps): update dependency protoc to v29.2

[renovate]

This PR contains the following updates:

Package	Update	Change
protoc	minor	29.1 -> 29.2

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Release Notes

protocolbuffers/protobuf (protoc)

v29.2: Protocol Buffers v29.2

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Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

C++

• Automated rollback of commit 23aada2. (#​19692) (protocolbuffers/protobuf@1772657)
• Remove unused / invalid C++ lazy repeated field code from OSS. (#​19682) (protocolbuffers/protobuf@3649f87)

Java

• Automated rollback of commit 23aada2. (#​19692) (protocolbuffers/protobuf@1772657)

Other

• Export environment variables so bazelisk picks them up (#​19690) (protocolbuffers/protobuf@8b9d76c)
• Pin staleness check to Bazel 7 (#​19689) (protocolbuffers/protobuf@a1c9b6a)
• Remove CMake downgrade workaround from Windows CI tests (#​19630) (protocolbuffers/protobuf@3a7bb4a)

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🦙 MegaLinter status: ✅ SUCCESS

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