Python: Add change note

Author: tausbn

python/ql/lib/change-notes/2025-12-09-python-support-relaxed-except-syntax.md

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+category: feature
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+* The extractor now supports the new, relaxed syntax `except A, B, C: ...` (which would previously have to be written as `except (A, B, C): ...`) as defined in [PEP-758](https://peps.python.org/pep-0758/).