chore: version bump to 3.4.0-rc

[scotthart]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request performs a routine version bump, updating the project's internal and external version identifiers to 3.4.0-rc. This change prepares the codebase for the upcoming release candidate phase, ensuring all version-related metadata is consistent.

Highlights

• Version Bump: The project version has been updated across various configuration and source files to 3.4.0-rc.

Changelog

• CHANGELOG.md
  • Added a new entry for version v3.4.0 with a 'TBD' release date.

Activity

• No specific activity has been recorded for this pull request yet.

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[gemini-code-assist]

Code Review

This pull request updates the project version to 3.4.0-rc. The changes are applied to CHANGELOG.md, CMakeLists.txt, MODULE.bazel, and google/cloud/internal/version_info.h to reflect the new version. I have found one issue in CHANGELOG.md regarding incompatibility with the release script, for which I've left a comment.

[gemini-code-assist]

The release.sh script, which is used to create GitHub releases, expects the version heading in CHANGELOG.md to match the tag exactly (e.g., ## v3.4.0). The current format ## v3.4.0 - TBD will not be found by the script, which will prevent the release notes from being automatically populated in the GitHub release. To ensure compatibility with the release script, please remove the - TBD from this line.

Suggested change

	## v3.4.0 - TBD
	## v3.4.0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.65%. Comparing base (702c057) to head (d5e9a46).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16043      +/-   ##
==========================================
- Coverage   92.65%   92.65%   -0.01%     
==========================================
  Files        2339     2339              
  Lines      215290   215290              
==========================================
- Hits       199482   199476       -6     
- Misses      15808    15814       +6     

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