Fix test_config in free-threaded builds

Lib/test/test_capi/test_config.py

@@ -100,6 +100,7 @@ def test_config_get(self):
             options.append(("run_presite", str | None, None))
         if sysconfig.get_config_var('Py_GIL_DISABLED'):
             options.append(("enable_gil", int, None))
+            options.append(("tlbc_limit", int, None))
         if support.MS_WINDOWS:
             options.extend((
                 ("legacy_windows_stdio", bool, None),