GitHub Actions: Test on Python 3.14 release candidate 3

[cclauss]

Python v3.14 -- October 7th

• https://www.python.org/download/pre-releases
• https://www.python.org/downloads/release/python-3140rc3
• https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md#allow-pre-releases

Blocked by:

• https://docs.python.org/3.14/whatsnew/3.14.html#pep-765-disallow-return-break-continue-that-exit-a-finally-block
• https://docs.python.org/3.14/reference/compound_stmts.html#finally-clause

Changed in version 3.14: The compiler emits a SyntaxWarning when a return, break or continue appears in a finally block (see PEP 765).

I am out of my depth on this one... Someone else would need to craft the correct solution.

[jakkdl]

it appears one (or more) of the test files have a return in a finally. Ideally the compile call should have a better error message and tell what file fails, but you can also try running all the files in the tests/eval_files (tests/autofix_files you can then fix with --generate-autofix) to see where the return in a finally is.

[cclauss]

Do we want to modify the test files to be compatible with Python 3.14, or do we want to update the linter to complain about test files that are not compatible with Python 3.14?