ci: Make consistence between pytest_*.py and .build-test-rules.yml for esp32c6 (i.e. to pass check_test_scripts_build_test_rules.py)

components/app_update/test_apps/pytest_app_update_ut.py

@@ -19,6 +19,7 @@ def run_multiple_stages(dut: Dut, test_case_num: int, stages: int) -> None:
 
 
 @pytest.mark.supported_targets
+@pytest.mark.temp_skip_ci(targets=['esp32c6'], reason='c6 support TBD')
 @pytest.mark.generic
 def test_app_update(dut: Dut) -> None:
     extra_data = dut.parse_test_menu()