[TF-M] Please Use Test Version Specified in TF-M CMake Configs

Hi All,

Please do use the tf-m-tests version specified in TF-M CMake configs (TFM_TEST_REPO_VERSION in trusted-firmware-m/lib/ext/tf-m-tests/repo_config_default.cmake), otherwise there might be some unexpected build errors. Please let us know if there is any problem.

Thanks, Xinyu