Update django-stubs/contrib/gis/db/models/functions.pyi

Co-authored-by: Nick Pope <[email protected]>

django-stubs/contrib/gis/db/models/functions.pyi

@@ -1,7 +1,7 @@
 from typing import Any
 
 from django.db.backends.base.base import BaseDatabaseWrapper
-from django.db.backends.mysql.compiler import SQLCompiler
+from django.db.models.sql.compiler import SQLCompiler, _AsSqlType
 from django.db.models import Func
 from django.db.models import Transform as StandardTransform