Changes:

• Pin a specific Python version (3.13.1) when installing python on the macos builder and the test_older_macos runner

Motivation:

• Fix the test_older_macos CI tests
  • Failures are of the form "Could not start process at /Users/runner/hostedtoolcache/Python/3.13.1/x64/bin/python3" (e.g. this run)
  • The macos-13 runner image was recently updated to have Python 3.13.2 but the other macos runners are still on Python 3.13.1
  • Notably, the "Setup python" step in the test_older_macos run shows "Successfully set up CPython (3.13.2)", which mismatches the version (3.13.1) that gets set up in the "Setup python" step of the build_macos (macos-14, x86_64) build that builds the macos_tests_Debug/Release artifacts uses in test_older_macos

Test plan:

• CI
• (I've validated that this change fixes the test_older_macos failures on a local fork with similar CI setup)

• ✅login: scottvanta / (f670131)

@scottvanta I kicked off the CI. Will be happy to merge once CI completes and you sign the CLA. Thank you!

Thanks! I've been working through the steps of getting the corporate CLA set up, hopefully should have an update soon!

Alright, CLA is signed and ready to go!

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