Tighten up CI with Zizmor

[akx]

Run uvx zizmor .github/workflows/ and heed its complaints:

• Pin third-party actions
• Adjust certain permissions

[github-advanced-security[bot]]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 91.93%. Comparing base (3bcc34e) to head (1a181e7).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1230   +/-   ##
=======================================
  Coverage   91.93%   91.93%           
=======================================
  Files          27       27           
  Lines        4688     4688           
=======================================
  Hits         4310     4310           
  Misses        378      378           

Flag	Coverage Δ
macos-14-3.10	90.97% <ø> (ø)
macos-14-3.11	90.91% <ø> (ø)
macos-14-3.12	91.12% <ø> (ø)
macos-14-3.13	91.12% <ø> (ø)
macos-14-3.14	91.10% <ø> (ø)
macos-14-3.8	90.84% <ø> (ø)
macos-14-3.9	90.90% <ø> (ø)
macos-14-pypy3.10	90.97% <ø> (ø)
ubuntu-24.04-3.10	90.99% <ø> (ø)
ubuntu-24.04-3.11	90.93% <ø> (ø)
ubuntu-24.04-3.12	91.14% <ø> (ø)
ubuntu-24.04-3.13	91.14% <ø> (ø)
ubuntu-24.04-3.14	91.12% <ø> (ø)
ubuntu-24.04-3.8	90.86% <ø> (ø)
ubuntu-24.04-3.9	90.92% <ø> (ø)
ubuntu-24.04-pypy3.10	90.99% <ø> (ø)
windows-2022-3.10	90.98% <ø> (ø)
windows-2022-3.11	90.92% <ø> (ø)
windows-2022-3.12	91.13% <ø> (ø)
windows-2022-3.13	91.13% <ø> (ø)
windows-2022-3.14	91.11% <ø> (ø)
windows-2022-3.8	90.96% <ø> (ø)
windows-2022-3.9	90.91% <ø> (ø)
windows-2022-pypy3.10	90.98% <ø> (ø)

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