ci: add actions/setup-python before smoke tests in update-python-platform

[Ankitsinghsisodya]

Problem

The update-python-platform.yaml workflow runs make test-python without first installing a specific Python version. This couples CI to the runner's pre-installed Python, which may differ from the project's required Python 3.10.

Fix

Add uses: actions/setup-python@v5 with python-version: "3.10" before the smoke test step, consistent with the PYTHON_VERSION: "3.10" used in functions.yaml.

Closes #3561

[knative-prow]

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This pull-request has been approved by: Ankitsinghsisodya
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[knative-prow]

Hi @Ankitsinghsisodya. Thanks for your PR.

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[Copilot]

Pull request overview

Ensures the update-python-platform.yaml workflow runs Python smoke tests against the project’s intended Python version (3.10) by explicitly installing it in CI, avoiding reliance on the runner’s preinstalled Python.

Changes:

• Add actions/setup-python@v5 to install Python 3.10 before running make test-python in the update-python-platform workflow.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.23%. Comparing base (d54878b) to head (51427ee).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3564      +/-   ##
==========================================
+ Coverage   53.76%   56.23%   +2.46%     
==========================================
  Files         180      180              
  Lines       20465    20465              
==========================================
+ Hits        11004    11509     +505     
+ Misses       8355     7756     -599     
- Partials     1106     1200      +94     

Flag	Coverage Δ
e2e	36.11% <ø> (-0.02%)	⬇️
e2e go	32.53% <ø> (-0.03%)	⬇️
e2e node	28.36% <ø> (-0.03%)	⬇️
e2e python	32.91% <ø> (ø)
e2e quarkus	28.50% <ø> (ø)
e2e rust	27.92% <ø> (ø)
e2e springboot	26.38% <ø> (ø)
e2e typescript	28.48% <ø> (-0.01%)	⬇️
e2e-config-ci	18.14% <ø> (ø)
integration	17.40% <ø> (?)
unit macos-14	43.37% <ø> (ø)
unit macos-latest	43.37% <ø> (ø)
unit ubuntu-24.04-arm	43.57% <ø> (ø)
unit ubuntu-latest	44.25% <ø> (ø)
unit windows-latest	43.39% <ø> (ø)

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