fix: update CASBIN_AUTO_LOAD_POLICY_INTERVAL to 0.5 to enable auto-save in tests

Author: BryanttV

openedx_authz/settings/test.py

@@ -69,4 +69,4 @@ def plugin_settings(settings):  # pylint: disable=unused-argument
 
 # Casbin configuration
 CASBIN_MODEL = os.path.join(ROOT_DIRECTORY, "engine", "config", "model.conf")
-CASBIN_AUTO_LOAD_POLICY_INTERVAL = 0
+CASBIN_AUTO_LOAD_POLICY_INTERVAL = 0.5