[python-win32] Obsolete code paths and version-specific checks

[Samuel Therrien]

Hi!
While working on adding annotations for typing support in pure python modules, I noticed a lot​ of conditions and code made to run on older versions of Python. Which are both EOL and no longer supported in pywin32. Removing those would alleviate a lot of code and help smooth out the addition and validation of Python 3.7+ annotations.
I would like to do a PR to tackle this, but first, is there anything specific I should be weary of?
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