chore(deps): update dependency protobuf to v5.29.4

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
protobuf	==5.29.3 -> ==5.29.4
protobuf	==5.27.2 -> ==5.29.4
protobuf	==5.28.1 -> ==5.29.4

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[gemini-code-assist]

Hello @renovate-bot, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

Summary of Changes

This pull request updates the protobuf dependency to version 5.29.4 in three different requirements.txt files. The update appears to be a routine dependency upgrade, likely to incorporate bug fixes, performance improvements, or new features from the protobuf library.

Highlights

• Dependency Update: The primary change is updating the protobuf dependency to version 5.29.4.
• File Modifications: The requirements.txt files in gemma2/, managedkafka/snippets/, and secretmanager/snippets/ are modified to reflect the new version.

Changelog

• gemma2/requirements.txt
  • Updated protobuf dependency from version 5.28.1 to 5.29.4.
• managedkafka/snippets/requirements.txt
  • Updated protobuf dependency from version 5.27.2 to 5.29.4.
• secretmanager/snippets/requirements.txt
  • Updated protobuf dependency from version 5.29.3 to 5.29.4.

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A proto's evolved,
Version numbers now resolved,
Bugs squashed with might,
Code shines ever bright,
Updates smoothly involved.

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[gemini-code-assist]

Code Review

This PR updates the protobuf dependency across multiple files. The changes seem straightforward, but I've reviewed them to ensure there are no unintended consequences.

Merge Readiness

The PR updates the protobuf dependency across multiple files. Given the nature of the change, I recommend ensuring that all tests pass after this update. I am unable to directly approve the pull request, and users should have others review and approve this code before merging.