python-freethreading: update livecheck and sync with py3.13 formulae

[chenrui333]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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[samford]

This isn't a versioned formula, so we may get into a situation where the version that's used in the regex isn't kept in sync with the latest stable version of Python in this case. Unless I'm missing something (e.g., technical restrictions, etc.), referencing the python alias would achieve the same goal without requiring anyone to remember to manually update this regex when we package a newer Python version.

[chenrui333]

good call, using python is a better choice

[samford]

Assuming we can't do ["python", "python-freethreading"] in synced_versions_formulae.json, we'll just have to remember to move python-freethreading into the newest Python array when we create formulae for a newer Python version.

[chenrui333]

we'll just have to remember to move python-freethreading into the newest Python array when we create formulae for a newer Python version.

yeah, I can imagine that would be popped up for py3.14