chore: don't use mtls in gcb until b/492452834 is fixed

[chandra-siri]

chore: don't use mtls in gcb until b/492452834 is fixed

Details in b/492452834

[gemini-code-assist]

Summary of Changes

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This pull request addresses potential instability in testing environments by precisely defining the version of the google-auth library. By pinning this dependency, the PR ensures that tests run against a known, stable version, thereby reducing the risk of failures caused by upstream library changes and improving the reliability of the test suite.

Highlights

• Dependency Pinning: The google-auth dependency has been explicitly pinned to version 2.48.0 in setup.py. This change aims to ensure consistent behavior and prevent unexpected issues that might arise from future google-auth updates during testing.

Changelog

• setup.py
  • Pinned the google-auth dependency to version 2.48.0.

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[gemini-code-assist]

Code Review

This pull request pins the google-auth dependency to a specific version, 2.48.0. While this ensures a specific version is used, it is a significant anti-pattern for a library package as it can easily create dependency conflicts for downstream users. The review contains a critical comment recommending to revert to a version range for google-auth, consistent with other dependencies in the project. Also, there is a small typo in the pull request title ('vesion' instead of 'version').