mypy fixup

Author: jbrockmendel

pandas/tests/dtypes/test_inference.py

@@ -1609,7 +1609,7 @@ def test_is_interval_array_subclass(self):
         # GH#46945
 
         class TimestampsInterval(Interval):
-            def __init__(self, left: str, right: str, closed: str = "both") -> None:
+            def __init__(self, left: str, right: str, closed="both") -> None:
                 super().__init__(Timestamp(left), Timestamp(right), closed)
 
             @property