Update the python version used by GHA runners

[a-maurice]

Description

Provide details of the change, and generalize the change in the PR title above.

Update the GHA runners to use Python 3.9. This is partially because of gcloud no longer working with 3.8

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Testing

Describe how you've tested these changes.

https://github.com/firebase/firebase-unity-sdk/actions/runs/18728093413

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Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

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[gemini-code-assist]

Summary of Changes

Hello @a-maurice, 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 focuses on a critical infrastructure update, specifically upgrading the Python version used by GitHub Actions runners to 3.9. This change addresses compatibility issues with external tools like gcloud that no longer function correctly with Python 3.8, thereby ensuring the continued stability and functionality of the build and deployment processes.

Highlights

• Python Version Update: The GitHub Actions (GHA) runners are being updated to utilize Python 3.9. This change is crucial as gcloud has encountered compatibility issues with Python 3.8, necessitating the upgrade.
• Interpreter Search Order: The PythonExecutor.cs file has been modified to include python3.9 in the list of preferred Python interpreters, ensuring that the application can correctly locate and use the updated Python version.

Ignored Files

• Ignored by pattern: .github/workflows/** (13)
  • .github/workflows/build-report.yml
  • .github/workflows/build_android.yml
  • .github/workflows/build_ios.yml
  • .github/workflows/build_linux.yml
  • .github/workflows/build_macos.yml
  • .github/workflows/build_starter.yml
  • .github/workflows/build_tvos.yml
  • .github/workflows/build_windows.yml
  • .github/workflows/generate_swig.yml
  • .github/workflows/integration_tests.yml
  • .github/workflows/package.yml
  • .github/workflows/retry-test-failures.yml
  • .github/workflows/update_versions.yml

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[AustinBenoit]

LGTM

[gemini-code-assist]

Code Review

This pull request adds python3.9 to the list of Python interpreters to be searched by GHA runners. This is a necessary update to support newer environments. I've added one comment suggesting a reordering of the interpreters list to make the version discovery more robust and ensure that newer, more specific versions are preferred.

[gemini-code-assist]

The order of interpreters in this array is significant. By placing python3.9 after the generic python3, it's possible that an older version of Python (like 3.8) is picked up if python3 symlinks to it, even if python3.9 is available. To make the interpreter discovery more robust and align with the goal of using Python 3.9 when possible, it's better to list specific versions from newest to oldest before the generic python3 command.

          "python3.9", "python3.8", "python3.7", "python3", "python2.7", "python2", "python"