databases/postgresql*-*: Revert "Update to latest version"
This restores databases/postgresql13-*, unbreaking the quarterly tree.
Please do not remove ports from quarterly if possible and if you do,
please test that the removal doesn't break anything!
Approved by: portmgr (build fix blanket)
Reported by: antoine
This reverts commit 7a01ab5cf6ffa91eae6cf6a372db56978608b2db.