Fix duplicate imports

[abzrg]

Hi, and thanks for sharing the source.

Mapping module was imported twice in foamlib/_cases.py.

[abzrg]

I've noticed that with the help of flake8. I think using a linter like that could be helpful.
If you want to use it and add the necessary configuration to pyproject.toml I can help with that.

[gerlero]

Thanks! Good catch.

I've noticed that with the help of flake8. I think using a linter like that could be helpful.
If you want to use it and add the necessary configuration to pyproject.toml I can help with that.

Sure, go ahead! It should also be configured to run on GitHub Actions (but I can take care of that part if you can't)

[abzrg]

Ok. Great!