solve mypy issue

Author: Laurent Mutricy

pandas/conftest.py

@@ -84,6 +84,9 @@
         Hashable,
         Iterator,
     )
+from typing import cast
+
+from pandas._typing import Dtype
 
 try:
     import pyarrow as pa
@@ -1448,7 +1451,7 @@ def complex_dtype(request):
     return request.param
 
 
-@pytest.fixture(params=tm.COMPLEX_DTYPES + tm.FLOAT_NUMPY_DTYPES)
+@pytest.fixture(params=tm.COMPLEX_DTYPES + cast(list[Dtype], tm.FLOAT_NUMPY_DTYPES))
 def complex_or_float_dtype(request):
     """
     Parameterized fixture for complex and numpy float dtypes.