ci: add mindeps job
The following discussion from !91 (merged) should be addressed:
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@ben.boeckel started a discussion: (+1 comment) This is fine for now. I think eventually we'll want to test minimum versions too.
To keep us honest :) .
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Windows (old VS, old Python) -
Linux (old GCC/gfortran; I've not seen ancient clang
matter nearly as much on Linux) -
macOS (no urgent need IMO; Apple EOL treadmills are fast enough that I'm not worried)