ignore deprecation warning in doctest

Author: MarcoGorelli

pandas/conftest.py

@@ -141,6 +141,7 @@ def pytest_collection_modifyitems(items, config) -> None:
         ("is_datetime64tz_dtype", "is_datetime64tz_dtype is deprecated"),
         ("is_categorical_dtype", "is_categorical_dtype is deprecated"),
         ("is_sparse", "is_sparse is deprecated"),
+        ("DataFrame.__dataframe__", "Interchange Protocol is deprecated"),
         ("DataFrameGroupBy.fillna", "DataFrameGroupBy.fillna is deprecated"),
         ("DataFrameGroupBy.corrwith", "DataFrameGroupBy.corrwith is deprecated"),
         ("NDFrame.replace", "Series.replace without 'value'"),