chore: fix conformance test failure due to VM's API version mismatch.

[chandra-siri]

Conformance tests were failing due to Docker API version mismatch in the kokoro's VM and docker client.

This PR pins the DOCKER_API_VERSION to 1.39

RCA for kokoro failures - https://screenshot.googleplex.com/4zsxoQ8UxqWnTky.

Error response from daemon: client version 1.52 is too new. Maximum supported API version is 1.39

[gemini-code-assist]

Summary of Changes

Hello @chandra-siri, 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!

This pull request addresses an issue with debugging conformance test failures by modifying the noxfile.py. The primary change involves removing the --quiet flag from the py.test commands used to execute these tests. This ensures that the complete test output is visible, thereby providing developers with the necessary information to effectively diagnose and resolve any test-related problems.

Highlights

• Debugging Conformance Tests: The --quiet flag has been removed from the py.test commands within the conftest_retry function in noxfile.py. This change is specifically aimed at making the output of conformance tests more verbose, which will assist in debugging failures.
• Improved Test Visibility: By removing the --quiet flag, the full output of py.test will now be displayed when running conformance tests, providing more detailed information for diagnosing issues.

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[gemini-code-assist]

Code Review

This pull request removes the --quiet flag from the py.test command within the conftest_retry nox session. This change is likely intended to get more verbose output to debug test failures. While effective for debugging, making this a permanent change would increase CI log verbosity. My feedback suggests an alternative approach that makes verbosity configurable via an environment variable, allowing for debugging when needed without permanently altering the CI output.

[chandra-siri]

/gcbrun