fix interval.repeat() typing

Author: Dr-Irv

pandas/core/arrays/interval.py

@@ -11,6 +11,7 @@
     Sequence,
     Type,
     TypeVar,
+    Union,
     cast,
 )
 
@@ -1493,7 +1494,9 @@ def delete(self: IntervalArrayT, loc) -> IntervalArrayT:
         return self._shallow_copy(left=new_left, right=new_right)
 
     @Appender(_extension_array_shared_docs["repeat"] % _shared_docs_kwargs)
-    def repeat(self: IntervalArrayT, repeats: int, axis=None) -> IntervalArrayT:
+    def repeat(
+        self: IntervalArrayT, repeats: Union[int, Sequence[int]], axis=None
+    ) -> IntervalArrayT:
         nv.validate_repeat((), {"axis": axis})
         left_repeat = self.left.repeat(repeats)
         right_repeat = self.right.repeat(repeats)