Backport protobuf and pgx upgrades [16.9]
Cherry-pick !6754 (merged) and !6707 (merged) into 16-9-stable to fix the failing vulnerability job (https://gitlab.com/gitlab-org/gitaly/-/jobs/6469132813).
Edited by Reuben Pereira
Cherry-pick !6754 (merged) and !6707 (merged) into 16-9-stable to fix the failing vulnerability job (https://gitlab.com/gitlab-org/gitaly/-/jobs/6469132813).