fixed input to filterwarnings in test_loc.py

Author: jhendricks487

pandas/tests/indexing/test_loc.py

@@ -2068,10 +2068,8 @@ def test_loc_setitem_with_expansion_inf_upcast_empty(self):
         tm.assert_index_equal(result, expected)
 
     @pytest.mark.filterwarnings(
-        [
-            "ignore:indexing past lexsort depth",
-            "ignore:Passing an empty string to Timestamp",
-        ]
+        "ignore:indexing past lexsort depth",
+        "ignore:Passing an empty string to Timestamp",
     )
     def test_loc_setitem_with_expansion_nonunique_index(self, index):
         # GH#40096