Revert "Without ClassVar test"

This reverts commit dcfa42e.

Author: q0w

django-stubs/contrib/gis/admin/options.pyi

@@ -10,7 +10,7 @@ from django.http import HttpRequest
 spherical_mercator_srid: int
 
 class GeoModelAdminMixin:
-    gis_widget: type[OSMWidget]
+    gis_widget: ClassVar[type[OSMWidget]]
     gis_widget_kwargs: ClassVar[dict[str, Any]]
     def formfield_for_dbfield(self, db_field: Field, request: HttpRequest, **kwargs: Any) -> FormField: ...
 

scripts/stubtest/allowlist.txt

@@ -394,3 +394,6 @@ django.urls.resolvers.URLPattern.lookup_str
 django.urls.resolvers.URLResolver.url_patterns
 django.urls.resolvers.URLResolver.urlconf_module
 django.utils.connection.BaseConnectionHandler.settings
+
+# Potential mypy bug with metaclass
+django.contrib.gis.admin.options.GeoModelAdminMixin.gis_widget