Fix mypy errors attributed to `pytorch_lightning.core.module.py`

[jxtngx]

What does this PR do?

Fix mypy errors attributed to pytorch_lightning.core.module.py for issue #13445

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

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[jxtngx]

Original errors after removing module from pyproject.toml can be viewed at: https://github.com/JustinGoheen/lightning/blob/lightningmodule/code-quality/type-hints/module_typehint_errors.md

[codecov[bot]]

Codecov Report

Merging #13603 (c1bf538) into master (7879628) will decrease coverage by 10%. The diff coverage is 93%.

@@            Coverage Diff            @@
##           master   #13603     +/-   ##
=========================================
- Coverage      86%      76%    -10%     
=========================================
  Files         330      330             
  Lines       26773    26809     +36     
=========================================
- Hits        22993    20385   -2608     
- Misses       3780     6424   +2644     

[jxtngx]

apologies, I'm no longer able to keep this PR up to date.

[awaelchli]

apologies, I'm no longer able to keep this PR up to date.

No worries, I will address reviews and finish it. There shouldn't be too much work left here. @rohitgr7 @carmocca