Configure CI to use setup-python's built-in pip caching

[janosh]

setup-python has built-in pip dependency caching.

Note caching was not working before as it used the hash of non-existent setup.py as the cache key.

Equivalent PR to pymatgen: materialsproject/pymatgen#2401

Also moves codespell pre-commit config to setup.cfg. I noticed setup.cfg was emptied in b82138e so I tried adding it to pyproject.toml instead but found that's not supported yet. Tracking issue: codespell-project/codespell#2055

Curious why did you decide to keep setup.cfg around?

[utf]

Thanks!

Would you mind leaving the setup.cfg empty and putting the codespell stuff back in the precommit file?

Basically, I want to get rid of setup.cfg but at the moment it is still required by pip for editable installations (or alternatively you can use a basic setup.py file). See the warning at the top of this page: https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html

[codecov]

Codecov Report

Merging #142 (c23dc88) into main (e95c50d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #142   +/-   ##
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  Coverage   73.14%   73.14%           
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  Files          49       49           
  Lines        4253     4253           
  Branches      672      672           
=======================================
  Hits         3111     3111           
  Misses        973      973           
  Partials      169      169           

[janosh]

Would you mind leaving the setup.cfg empty and putting the codespell stuff back in the precommit file?

Of course.

[utf]

Thanks very much!