lint: Update mypy

requirements.txt

@@ -48,7 +48,7 @@ markupsafe==2.1.2
     # via jinja2
 mccabe==0.7.0
     # via flake8
-mypy==0.991
+mypy==1.0.1
     # via -r requirements.in
 mypy-extensions==0.4.3
     # via

tornado/autoreload.py

@@ -338,9 +338,7 @@ def main() -> None:
         # no longer in sys.modules.  Figure out where it is and watch it.
         loader = pkgutil.get_loader(opts.module)
         if loader is not None and isinstance(loader, importlib.abc.FileLoader):
-            # TODO: fix when we update typeshed
-            watch(loader.get_filename())  # type: ignore
-
+            watch(loader.get_filename())
     if opts.until_success and not exit_status:
         return
     wait()