Allow caching python venv for use in CI

[fredderf121]

I'm using python with devenv via languages.python with a venv.
Is there a way to set up caching in a github action for the pip modules?
In the actions log I see the following lines:

Python interpreter changed, rebuilding Python venv...
/nix/store/fwwchj5n2v14qdsvna2kh8kz0vkrdlq6-python3-3.12.4-env/bin/python3.12 -m venv --upgrade-deps /home/runner/work/my-project/.devenv/state/venv
Requirements changed, running pip install -r /nix/store/d25d1fbdlkvi6l44gppkqda31k9vj0id-requirements.txt...

which is then followed by all the modules being downloaded, built, and installed. Is there a way to avoid this repeated work?