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the Github Actions infrastructure is progressively phasing in a newer base image of Ubuntu:
https://github.blog/changelog/2022-11-09-github-actions-ubuntu-latest-workflows-will-use-ubuntu-22-04/
that means that we are somewhat randomly going to see images that lack Python
3.6
from the build cache sometimes per:Python 3.6 fails to setup actions/setup-python#355 (comment)
instead of pinning to an old version of Ubuntu in GHA for 3.6 support, let's just drop 3.6 from the testing matrix per:
MAINT: when Python 3.6 is dropped #510 (comment) (it has been EOL for 1 year)
there's also no reason to retain the special Python
3.10
handling where we use Ubuntu22.04
for that case, for two reasons:22.04
is being rolled out as the new default anyway3.10
was resolved by using contexts, so special treatment not justified anymore