Since the upstream sources (containers-midstream and proxy-midstream) are still being pointed to the release branches we need to ensure that they are redirected back to the HEAD branches

Make sure that the commit’s are pointing to the maistra-X.Y branches 

Examples:

• https://gitlab.cee.redhat.com/istio/cpaas/containers-midstream/-/merge_requests/1169
• https://gitlab.cee.redhat.com/istio/cpaas/containers-midstream/-/merge_requests/1170 (In that example also extra deleted operator container it should be done only during 2.Y release in one of the previous steps, on that step need only to change branch and if needed SHA)
• https://gitlab.cee.redhat.com/istio/cpaas/containers-midstream/-/merge_requests/1171
• https://gitlab.cee.redhat.com/istio/cpaas/proxy-midstream/-/merge_requests/615
• https://gitlab.cee.redhat.com/istio/cpaas/proxy-midstream/-/merge_requests/616
• https://gitlab.cee.redhat.com/istio/cpaas/proxy-midstream/-/merge_requests/617