Add zizmor to pre-commit and fix findings

[hugovk]

We're not using Trusted Publishers yet:

  info[use-trusted-publishing]: prefer trusted publishing for authentication
    --> .github/workflows/deploy.yml:42:9
     |
  42 |         uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # v1.14.0
     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this step
  ...
  45 |           password: ${{ secrets.PYPI_API_TOKEN }}
     |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ uses a manually-configured credential instead of Trusted Publishing
     |
     = note: audit confidence → High

This is only an informational finding, so I've ignored it for now. We should switch over at some point, which requires some minimal config for the project on PyPI.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (0720138) to head (3cc9c4d).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #174   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          547       558   +11     
  Branches        74        43   -31     
=========================================
+ Hits           547       558   +11     

Flag	Coverage Δ
macOS-latest	100.00% <ø> (ø)
ubuntu-latest	100.00% <ø> (ø)
windows-latest	100.00% <ø> (ø)

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