MAINT: unpin mypy

[tylerjereddy]

• mypy 1.0.0 was released on Feb. 6/2023, and we recently pinned it down to older versions while working on more important things because we had a few new type hinting issues pop up

• fix the type hinting issues, which were actually just ignore directives on try/except blocks that are no longer needed, so that's a clear win I think

• I doubt it matters much for us, but mypy 1.0.0 can be ~40 % faster on large codebases: https://mypy-lang.blogspot.com/2023/02/mypy-10-released.html

[tylerjereddy]

Ah, confusingly the issue does still exist on mypy 1.0.0: https://github.com/python/mypy/issues/13914#issuecomment-1420406716

It just didn't show up when I tested with Python 3.10 locally, which uses a different code path.