[WIP] Fix mypy typing for utilities.auto_restart

[stancld]

Still, WIP and some mypy issues need to be fixed.

What does this PR do?

Part of #7037. This PR disentangles large #7218. It fixes mypy typing in utilities.auto_restart.py

Does your PR introduce any breaking changes? If yes, please list them.

None

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[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. If you need further help see our docs: https://pytorch-lightning.readthedocs.io/en/latest/generated/CONTRIBUTING.html#pull-request or ask the assistance of a core contributor here or on Slack. Thank you for your contributions.

[tchaton]

Won't update works ?

[stancld]

It returns me the following mypy error on my local:

pytorch_lightning/utilities/auto_restart.py:421: error: Argument 1 to "update" of "dict" has incompatible type "Dict[int, Dict[str, int]]"; expected "Mapping[Union[int, str], Union[Dict[str, int], int, None]]"  [arg-type]

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. If you need further help see our docs: https://pytorch-lightning.readthedocs.io/en/latest/generated/CONTRIBUTING.html#pull-request or ask the assistance of a core contributor here or on Slack. Thank you for your contributions.

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This pull request is going to be closed. Please feel free to reopen it create a new from the actual master.