Test against Python 3.15-dev, bump ty and Black

[simonw]

Testing against the pre-release of 3.15.

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📚 Documentation preview 📚: https://sqlite-utils--738.org.readthedocs.build/en/738/

[codecov]

Codecov Report

❌ Patch coverage is 91.48936% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.16%. Comparing base (8d74ffc) to head (44edc65).

Files with missing lines	Patch %	Lines
sqlite_utils/utils.py	80.00%	3 Missing ⚠️
sqlite_utils/db.py	96.15%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #738      +/-   ##
==========================================
+ Coverage   95.15%   95.16%   +0.01%     
==========================================
  Files           8        8              
  Lines        3114     3122       +8     
==========================================
+ Hits         2963     2971       +8     
  Misses        151      151              

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[simonw]

ty tests fail in CI but pass on my laptop because my laptop is running ty 0.0.2 but CI is running ty 0.0.37.