Cuequivariance dependency leads to unsupported Python versions

[thomas-rocke]

Cuequivariance uses Python 3.10 features, which conflicts with the claim that mace supports Python >= 3.7.

Cuequivariance was initially an optional dependency, but 5b2bd9a promoted it to a mandatory dependency.

[ilyes319]

@thomas-rocke, thank you that's a bug, cueq should stay optional dependency for now. I will switch back. Note that the Python versions are all over the place any atm, I need to make a good estimate, 3.10 is the most safe to go for, regardless of cueq or not.

[thomas-rocke]

I've been able to use Python 3.9.6 with mace@4c1ad89 (which is after the introduction of cuequivariance, but before it became mandatory).

My recommendation would be to follow the officially supported versions (https://devguide.python.org/versions/) - Python 3.9 is supported until the end of this year, but it may be more convenient to preempt the end of life and just stick with 3.10+ as you suggested.