Update mypy to the latest

This includes updating the ignore comments for things which mypy
now knows about or now complains about, as well as pulling in some
typeshed packages for things outside the standard library.

jedi/utils.py

@@ -2,7 +2,7 @@
 Utilities for end-users.
 """
 
-import __main__  # type: ignore[import]
+import __main__
 from collections import namedtuple
 import logging
 import traceback