remove pytest pin

[d-v-b]

removes the pin on the upper bound of pytest, as the motivating reason for that pin seems to be resolved.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.89%. Comparing base (ee0e69a) to head (bbec36b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3619      +/-   ##
==========================================
+ Coverage   59.14%   60.89%   +1.74%     
==========================================
  Files          86       86              
  Lines       10172    10172              
==========================================
+ Hits         6016     6194     +178     
+ Misses       4156     3978     -178     

see 4 files with indirect coverage changes

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[d-v-b]

pre-commit failure is unrelated. and we should look at removing the pytest-asyncio pin