chore(deps): bump pytz

[jennifer-richards]

Doing this now avoids migrations in the feat/py312 PR (#8811). That will let us revert to the previous 3.9-based datatracker release if we discover something badly broken after deploying 3.12.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.73%. Comparing base (f5df667) to head (ca9fcf3).
⚠️ Report is 28 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9385      +/-   ##
==========================================
- Coverage   88.74%   88.73%   -0.01%     
==========================================
  Files         320      320              
  Lines       41674    41807     +133     
==========================================
+ Hits        36984    37098     +114     
- Misses       4690     4709      +19     

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