TST: xfail geopandas downstream test (#18786)

xref #18780

Author: jreback

pandas/tests/test_downstream.py

@@ -92,6 +92,7 @@ def test_pandas_datareader():
     pandas_datareader.get_data_google('AAPL')
 
 
+@pytest.mark.xfail(reason="install not working, gh-18780")
 def test_geopandas():
 
     geopandas = import_module('geopandas')  # noqa