chore: Resolve CI failures

[effigies]

• setuptools has started pulling non-public APIs from distutils, breaking the py39-min tests. The simplest solution is to require numpy >=1.23, which deprecated numpy.distutils and removed it from any import tree we use.
• Ruff has started auto-fixing return types that could be Self. I would like to remove the typing_extensions dependency, but this does not introduce it.
• Either mypy or numpy made some modification that requires us to better type something that expects an integer type or an integer dtype. Easy enough.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.34%. Comparing base (84294f4) to head (6948625).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1413   +/-   ##
=======================================
  Coverage   95.34%   95.34%           
=======================================
  Files         208      209    +1     
  Lines       29772    29777    +5     
  Branches     3355     3357    +2     
=======================================
+ Hits        28385    28390    +5     
  Misses        948      948           
  Partials      439      439           

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