Automated cherry pick of #121364: bump golang.org/grpc to v1.56.3 (!121545) · Merge requests · gitlab-migration-large-import-test / single-project / kubernetes · GitLab

Cherry pick of #121364 on release-1.28.

#121364: bump golang.org/grpc to v1.56.3

For details on the cherry pick process, see the cherry pick requests page.