TST: Use Ubuntu 20.04 for running CI test suite #1452
Merged
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Closes #1451
This sets the test suite to use
ubuntu-20.04
as opposed toubuntu-latest
as the latter switched over in the last day or so to usingubuntu-22.04
and that broke testing Python 3.6. Ubuntu 20.04 has maintenance fixes for another ~2.5 years, and is supported critically for another 5 years after that, so the OS itself should be fine until we drop support for Python 3.6, and could then switch toubuntu-22.04
. It's also possible that the latter image will become compatible with Python 3.6 as well, but who knows.