Correct type for db.models.sql.query.Query.join() argument (#2055)

The argument should be an instance, not a class.

Author: mthuurne

django-stubs/db/models/sql/query.pyi

@@ -199,7 +199,7 @@ class Query(BaseExpression):
     def build_lookup(self, lookups: Sequence[str], lhs: Expression | Query, rhs: Any) -> Lookup: ...
     def try_transform(self, lhs: Expression | Query, name: str) -> Transform: ...
     def join(
-        self, join: type[BaseTable | Join], reuse: str | None = ..., reuse_with_filtered_relation: bool = ...
+        self, join: BaseTable | Join, reuse: str | None = ..., reuse_with_filtered_relation: bool = ...
     ) -> str: ...
 
 class JoinPromoter: