fix type errors

Author: yangdanny97

pandas-stubs/core/frame.pyi

@@ -892,7 +892,7 @@ class DataFrame(NDFrame, OpsMixin, _GetItemHack):
         self,
         periods: int | Sequence[int] = ...,
         freq: DateOffset | dt.timedelta | _str | None = ...,
-        axis: Axis = None,
+        axis: Axis | None = None,
         fill_value: Scalar | NAType | None = ...,
     ) -> Self: ...
     @overload

pandas-stubs/core/indexes/timedeltas.pyi

@@ -79,8 +79,8 @@ class TimedeltaIndex(DatetimeTimedeltaMixin[Timedelta], TimedeltaIndexProperties
     def shift(self, periods: int = ..., freq=...) -> Self: ...
 
 def timedelta_range(
-    start: TimedeltaConvertibleTypes = None,
-    end: TimedeltaConvertibleTypes = None,
+    start: TimedeltaConvertibleTypes | None = None,
+    end: TimedeltaConvertibleTypes | None = None,
     periods: int | None = None,
     freq: str | DateOffset | Timedelta | dt.timedelta | None = ...,
     name: Hashable | None = None,

pandas-stubs/core/series.pyi

@@ -1141,7 +1141,7 @@ class Series(IndexOpsMixin[S1], NDFrame):
         self,
         periods: int | Sequence[int] = ...,
         freq: DateOffset | timedelta | _str | None = ...,
-        axis: Axis = None,
+        axis: Axis | None = None,
         fill_value: Scalar | NAType | None = ...,
     ) -> Series: ...
     def info(