Test against PyPy 3.11

[jwodder]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.06%. Comparing base (195f454) to head (7599c06).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master       #7   +/-   ##
=======================================
  Coverage   96.06%   96.06%           
=======================================
  Files           3        3           
  Lines         229      229           
  Branches       38       38           
=======================================
  Hits          220      220           
  Misses          4        4           
  Partials        5        5           

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