Partly fix conda ci and update python versions tested #35111
Merged
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📚 Description
Currently, the conda ci workflow fails on ubuntu (https://github.com/sagemath/sage/actions/runs/4158846126/jobs/7194339951) due to conda/conda#12303 and/or actions/runner-images#6910. We fix this for the time being by downgrading conda to 4.12 as recommended in actions/runner-images#6910 (comment).
Moreover, the python versions tested is updated to >= 3.9.
This doesn't completely fix the conda workflow though. There seem to be quite a few upstream issues as revealed in https://github.com/tobiasdiez/sage/actions/runs/4160653080:
Maybe some of these are related to #34776. CC: @isuruf
But at least now the standard build on python 3.9 and 3.10 starts, so I would propose to get this in and then work in follow-up PRs on fixing the remaining issues.
📝 Checklist
⌛ Dependencies