feat: add support for Python 3.11

[ziegenberg]

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Fixes#467 🦕

[dandhlee]

Hi there, it doesn't seem like you're working with Google. Could you open a GitHub issue first?

[ziegenberg]

Hi there, it doesn't seem like you're working with Google. Could you open a GitHub issue first?

That's right; I do work with Google. I will open an issue.

I followed #284 when creating this PR, which also did not have an accompanying issue.

[ziegenberg]

The python -m py.test call had to be changed to python -m pytest, otherwise it would always fail with:

Error while finding module specification for 'py.test' (ModuleNotFoundError: __path__ attribute not found on 'py' while trying to find 'py.test')

[ziegenberg]

If it's okay with you, I would rebase my PR onto the current main. That should solve the Commit message did not follow Conventional Commits error.

[parthea]

I found that the minimum version of grpcio is 1.49.1 for python 3.11. I've updated the setup.py to reflect that.

[parthea]

Thanks @ziegenberg!