Use TypeAlias for type aliases where possible, part II (#7667)

stubs/python-dateutil/dateutil/relativedelta.pyi

@@ -1,6 +1,7 @@
 from _typeshed import Self
 from datetime import date, datetime, timedelta
 from typing import SupportsFloat, TypeVar, overload
+from typing_extensions import TypeAlias
 
 from ._common import weekday
 
@@ -8,7 +9,7 @@ from ._common import weekday
 _SelfT = TypeVar("_SelfT", bound=relativedelta)
 _DateT = TypeVar("_DateT", date, datetime)
 # Work around attribute and type having the same name.
-_weekday = weekday
+_weekday: TypeAlias = weekday
 
 MO: weekday
 TU: weekday

stubs/python-dateutil/dateutil/rrule.pyi

@@ -1,5 +1,6 @@
 import datetime
 from typing import Any, Iterable
+from typing_extensions import TypeAlias
 
 from ._common import weekday as weekdaybase
 
@@ -81,7 +82,7 @@ class _iterinfo:
     def mtimeset(self, hour, minute, second): ...
     def stimeset(self, hour, minute, second): ...
 
-_rrule = rrule
+_rrule: TypeAlias = rrule
 
 class rruleset(rrulebase):
     class _genitem: