PythonCall requires Python 3.10+

[rwest]

The release notes just call it "housekeeping" but pythoncall as of the last release (November) requires python 3.10

JuliaPy/PythonCall.jl#696

This is causing our continuous integration to fail. See #2860

[JacksonBurns]

This can be temporarily resolved in #2860 by limiting the supported versions of PythonCall to before this version.

Long term, we can support this version of PythonCall once we merge #2796

[rwest]

I maybe did this too quickly, but it looks like the only place to restrict that version is in the for_rmg branch of ReactionMechanismSimulator.jl so I have tried that.