Disable commands tests for old Erlang/OTP versions

Since recently, this test fails with Erlang/OTP 22 and lower:
  =result        failed:
    {test_case_failed,
     "Received input:
      [{error,{compilation_failed,
         \"/home/runner/.ejabberd-modules/sources/ejabberd-contrib/mod_example/src/mod_example.erl\"}}]
      don't match expected patterns:ok"},

test/commands_tests.erl

@@ -34,6 +34,13 @@
 %%%==================================
 %%%% setup
 
+-ifdef(OTP_BELOW_24).
+
+single_cases() ->
+    {commands_single, [sequence], []}.
+
+-else.
+
 single_cases() ->
     {commands_single,
      [sequence],
@@ -51,6 +58,8 @@ single_cases() ->
       single_test(http_list_tuple_map),
       single_test(clean)]}.
 
+-endif.
+
 setup(_Config) ->
     M = <<"mod_example">>,
     clean(_Config),