Skip AWS auth test when python3-saml not installed (apache#41582)

Python3-saml is an optional dependency of Amazon provider and in
case of Airflow 2.9 tests python3-saml is not installed yet, so we
should skip the tests in case it is not.

tests/providers/amazon/aws/auth_manager/test_aws_auth_manager.py

@@ -785,6 +785,7 @@ def test_security_manager_return_default_security_manager(self, auth_manager_wit
     def test_get_cli_commands_return_cli_commands(self, auth_manager):
         assert len(auth_manager.get_cli_commands()) > 0
 
+    @pytest.importorskip("python3-saml")
     @pytest.mark.db_test
     @patch.object(AwsAuthManagerAmazonVerifiedPermissionsFacade, "get_batch_is_authorized_single_result")
     @patch.object(AwsAuthManagerAmazonVerifiedPermissionsFacade, "get_batch_is_authorized_results")