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/newlib/test_apps/pytest_newlib.py

@@ -6,6 +6,7 @@ from pytest_embedded import Dut
 
 
 @pytest.mark.supported_targets
+@pytest.mark.temp_skip_ci(targets=['esp32c6'], reason='c6 support TBD')
 @pytest.mark.generic
 def test_newlib(dut: Dut) -> None:
     dut.expect_unity_test_output()