fixup! Add GeoModelAdminMixin

Author: q0w

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

@@ -1,7 +1,7 @@
-from typing import Any
+from typing import Any, ClassVar
 
 from django.contrib.admin import ModelAdmin
-from django.contrib.gis.forms import BaseGeometryWidget
+from django.contrib.gis.forms import OSMWidget
 from django.db.models import Field
 from django.forms.fields import Field as FormField
 from django.forms.widgets import Media
@@ -10,8 +10,8 @@ from django.http import HttpRequest
 spherical_mercator_srid: int
 
 class GeoModelAdminMixin:
-    gis_widget: BaseGeometryWidget
-    gis_widget_kwargs: dict[str, Any]
+    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: ...
 
 class GISModelAdmin(GeoModelAdminMixin, ModelAdmin): ...