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/api/keywords.py

@@ -5,8 +5,7 @@ from typing import Dict, Optional
 from jedi.inference.names import AbstractArbitraryName
 
 try:
-    # https://github.com/python/typeshed/pull/4351 adds pydoc_data
-    from pydoc_data import topics  # type: ignore[import]
+    from pydoc_data import topics
     pydoc_topics: Optional[Dict[str, str]] = topics.topics
 except ImportError:
     # Python 3.6.8 embeddable does not have pydoc_data.