Freeze pre-commit hook revisions

[AlexWaygood]

Pin all seven pre-commit hook repositories to the commits corresponding to their existing versions so the hooks no longer depend on mutable tags. This is better for security. Preserve the original tags in # frozen: comments for readability.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.26%. Comparing base (a697011) to head (5df026a).

@@           Coverage Diff           @@
##             main     #791   +/-   ##
=======================================
  Coverage   97.26%   97.26%           
=======================================
  Files           3        3           
  Lines        7859     7859           
=======================================
  Hits         7644     7644           
  Misses        215      215           

Flag	Coverage Δ
3.10	88.85% <ø> (ø)
3.10.4	88.85% <ø> (ø)
3.11	88.02% <ø> (ø)
3.11.0	87.27% <ø> (ø)
3.12	87.96% <ø> (ø)
3.12.0	87.94% <ø> (ø)
3.13	83.39% <ø> (ø)
3.13.0	84.09% <ø> (ø)
3.14	79.53% <ø> (ø)
3.9	89.53% <ø> (ø)
3.9.12	89.53% <ø> (ø)
pypy3.10	88.68% <ø> (ø)
pypy3.11	87.88% <ø> (ø)
pypy3.9	89.37% <ø> (ø)

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