Fix trailing whitespace in test_mixed_int_string.py

Author: xaris96

pandas/tests/indexes/test_mixed_int_string.py

@@ -3,12 +3,12 @@
 
 def test_mixed_int_string_index():
     idx = pd.Index([0, "a", 1, "b", 2, "c"])
-    
+
     # Check if the index is of type Index
     assert len(idx) == 6
     assert idx[1] == "a"
     assert idx[-1] == "c"
-    
+
     # Check if the index is sorted (it should not be)
     with pytest.raises(TypeError):
         idx.sort_values()