CI: temp skip geopandas downstream tests (GH18456) (#18457)

Author: jorisvandenbossche

pandas/tests/test_downstream.py

@@ -92,6 +92,7 @@ def test_pandas_datareader():
     pandas_datareader.get_data_google('AAPL')
 
 
+@pytest.mark.skip(reason="import issue with fiona GH18456")
 def test_geopandas():
 
     geopandas = import_module('geopandas')  # noqa