should we limit bioconda sourmash packages by Python version?

[ctb]

I ran into this problem that appears to happen because:

• sourmash (bioconda) is a pure Python package that is available for Python 3.7
• sourmash-minimal (conda-forge) is only available for Python 3.8, 3.9, and 3.10
• so when trying to install sourmash on Python 3.7, it can't find an appropriate sourmash-minimal for recent versions.

The meta.yaml bioconda recipe doesn't seem to restrict Python version in any way -

https://github.com/bioconda/bioconda-recipes/pull/38223/files

Is this something we can/should change?

[ctb]

ref #2503

[luizirber]

Probably a good idea, and we should bump in bioconda as we bump minimum Python version here.
#2848 drops 3.8 and 3.9 too.