Update the error message in test_loc.py

Author: natmokval

pandas/tests/indexing/test_loc.py

@@ -3162,7 +3162,7 @@ def test_loc_getitem_setitem_integer_slice_keyerrors(self):
 
         # non-monotonic, raise KeyError
         s2 = ser.iloc[list(range(5)) + list(range(9, 4, -1))]
-        msg = "non-monotonic index with a non-specific label: 3"
+        msg = "non-monotonic index with a missing label 3"
         with pytest.raises(KeyError, match=msg):
             s2.loc[3:11]
         with pytest.raises(KeyError, match=msg):