temporariy mark slow

Author: mjreno

autotest/test_mf6.py

@@ -1963,6 +1963,7 @@ def test_array(function_tmpdir):
 
 
 @requires_exe("mf6")
+@pytest.mark.slow
 def test_grid_array(function_tmpdir):
     # get_data
     # empty data in period block vs data repeating