[GSTG][PG14] Use correct tool versions

gitlab-psql uses /opt/gitlab/embedded/bin/psql on some hosts which is not the latest version.

We should make sure we use psql as well as the other included tools like pg_basebackup in the latest available version, or at least at the version of the associated database.

root@postgres-registry-dr-delayed-01-db-gprd.c.gitlab-production.internal:~# gitlab-psql --version
psql (PostgreSQL) 12.6

Acceptance criteria

• all PostgreSQL tools are used in the latest version,, or at least at the version of the associated database