Update Python version range to 3.10–3.14 in CONTRIBUTING.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: derek73

CONTRIBUTING.md

@@ -24,7 +24,7 @@ You can also pass a name string to `tests.py` to see how it will be parsed:
     	Suffix: ''
     ]>
 
-CI runs tests against Python 3.10–3.13 via GitHub Actions on every push and pull request.
+CI runs tests against Python 3.10–3.14 via GitHub Actions on every push and pull request.
 
 Writing Tests
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