[FEATURE REQUEST] Support for Python 3.11

[cclauss]

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I am always frustrated when a new version of Python ships but my favorite tools are yet not compatible with it.

• https://devguide.python.org/versions
• https://www.python.org/download/pre-releases
• Add Python 3.11-dev to Github actions pylint-dev/pylint#5920

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Python 3.11 release candidate 2 is tested and passes on this repo's continuous integration system.

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[Pierre-Sassoulas]

Blocked by pylint-dev/pylint#6551 which itself is blocked by https://github.com/uqfoundation/dill/milestone/17 which itself is blocked by uqfoundation/dill#475

[Pierre-Sassoulas]

I created a MR : #532

Some tests do not work, any help would be appreciated.

[cclauss]

• https://docs.python.org/3.11/whatsnew/3.11.html#pathlib

Also,

Removed the class_getitem() method from pathlib.PurePath, because it was not used and added by mistake in previous versions. (Contributed by Nikita Sobolev in bpo-46483.)

[Pierre-Sassoulas]

Closed by #543