revert to 1.8 images
we are reverting to 1.8 as 1.9 seems to have a few issues that are not fixed or at least explained upstream e.g https://github.com/kubeflow/pipelines/issues/11090
we are reverting to 1.8 as 1.9 seems to have a few issues that are not fixed or at least explained upstream e.g https://github.com/kubeflow/pipelines/issues/11090