ci: use setup-python v4 with Python 3.11

[abdelkadermeflahi6-web]

Motivation

• Ensure workflows use the v4 release of the actions/setup-python action for compatibility and consistency.
• Normalize the python-version quoting to a consistent "3.11" across workflows.

Description

• Updated actions/setup-python@v5 to actions/setup-python@v4 in ./github/workflows/ci.yml, ./github/workflows/protection.yml, and ./github/workflows/python-validation.yml.
• Normalized python-version lines to use "3.11" where the setup step was modified.
• No other workflow logic was changed.

Testing

• Ran rg -n "actions/setup-python@|python-version" .github/workflows to confirm occurrences were updated, and the command returned the updated lines successfully.
• Used git diff -- .github/workflows/ci.yml .github/workflows/protection.yml .github/workflows/python-validation.yml to inspect diffs and verify the exact changes, which succeeded.
• Printed the updated workflow files with nl -ba .github/workflows/*.yml | sed -n '1,40p' to validate the uses and python-version lines were correctly written, and the output matched expectations.

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