Upgrade mypy and django-stubs to the latest version

Author: Photonios

psqlextra/introspect/models.py

@@ -7,6 +7,7 @@
     Optional,
     Type,
     TypeVar,
+    Union,
     cast,
 )
 
@@ -115,9 +116,10 @@ def models_from_cursor(
             )
 
             for index, related_field_name in enumerate(related_fields):
-                related_model = model._meta.get_field(
-                    related_field_name
-                ).related_model
+                related_model = cast(
+                    Union[Type[Model], None],
+                    model._meta.get_field(related_field_name).related_model,
+                )
                 if not related_model:
                     continue
 

setup.py

@@ -97,7 +97,7 @@ def run(self):
             "docformatter==1.4",
             "mypy==1.2.0; python_version > '3.6'",
             "mypy==0.971; python_version <= '3.6'",
-            "django-stubs==1.16.0; python_version > '3.6'",
+            "django-stubs==4.2.7; python_version > '3.6'",
             "django-stubs==1.9.0; python_version <= '3.6'",
             "typing-extensions==4.5.0; python_version > '3.6'",
             "typing-extensions==4.1.0; python_version <= '3.6'",