Replace Literal[None] with None in typing

[cyyever]

This PR replaces Literal[None] with None in typing.

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @ipiszy @chenyang78 @kadeng @muchulee8 @amjames @chauhang @aakhundov @coconutruben

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[vadimkantorov]

I also wonder what's the stance on Optional[T] -> T | None? (and List -> list, Dict -> dict, Tuple -> tuple etc). This would reduce needed number of from typing import ...

[cyyever]

@pytorchbot label "topic: not user facing"

[cyyever]

@vadimkantorov It is not a good time to change them because the build system still assumes Python 3.9.

[vadimkantorov]

oh right :( though python 3.9 EOL's in roughly one month

[cyyever]

@vadimkantorov Yes, we can start the changes one or two weeks later.

[Skylion007]

There is a ruff rule for this, don't know if it's out of preview yet

[Skylion007]

I also wonder what's the stance on Optional[T] -> T | None? (and List -> list, Dict -> dict, Tuple -> tuple etc). This would reduce needed number of from typing import ...

We have a ruff rule here we need to enable, but haven't yet. We can't remove all instances in the codebase because there are some tests for backward compatibility / handling of backwards compatibility.

[Skylion007]

@pytorchbot merge

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