Support for gemma architecture models

[levmckinney]

We also need to bump some dependencies for this since gemma does not exist in the version of transformers we were requiring.

[norabelrose]

Sounds good, it looks like it's currently failing because the mockmodel doesn't exist on the HF hub or something? I'm not super familiar with your unit tests, I'd need to look at it more carefully.

I'm definitely fine with bumping the transformer dependency, we could also drop Python 3.9 support too while we're at it (enabling | for union types)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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[norabelrose]

Looks like we're just failing on TypeError: Subscripted generics cannot be used with class and instance checks, shouldn't be hard to fix