[dateutil] Fix Generator parameters

Author: eliroca

stubs/python-dateutil/dateutil/rrule.pyi

@@ -64,7 +64,7 @@ class rrulebase:
     def count(self) -> int | None: ...
     def before(self, dt: datetime.datetime, inc: bool = False) -> datetime.datetime | None: ...
     def after(self, dt: datetime.datetime, inc: bool = False) -> datetime.datetime | None: ...
-    def xafter(self, dt: datetime.datetime, count: int | None = None, inc: bool = False) -> Generator[datetime.datetime]: ...
+    def xafter(self, dt: datetime.datetime, count: int | None = None, inc: bool = False) -> Generator[datetime.datetime, None, None]: ...
     def between(
         self, after: datetime.datetime, before: datetime.datetime, inc: bool = False, count: int = 1
     ) -> list[datetime.datetime]: ...