Bump mypy 0.950 (#939)

* Bump mypy to 0.95x

* Remove the * for inferred types

There was an upstream change (https://github.com/python/mypy/pull/12459)
to remove * from inferred types in the reveal_type output.

As we are asserting the * to exist, all the test cases are now failing
on the 0.950 release. Removing the expected * to mirror the upstream
behaviour change should resolve the test failures.

tests/typecheck/db/test_connection.yml

@@ -7,7 +7,7 @@
 -   case: raw_connections
     main: |
       from django.db import connections
-      reveal_type(connections["test"])  # N: Revealed type is "django.db.backends.base.base.BaseDatabaseWrapper*"
+      reveal_type(connections["test"])  # N: Revealed type is "django.db.backends.base.base.BaseDatabaseWrapper"
       for connection in connections.all():
         with connection.cursor() as cursor:
           reveal_type(cursor)  # N: Revealed type is "django.db.backends.utils.CursorWrapper"