Revert "Postgres: Switch the datasource plugin from lib/pq to pgx (#8… (#85509)
Revert "Postgres: Switch the datasource plugin from lib/pq to pgx (#83768)"
This reverts commit ecd6de826a.
(cherry picked from commit 8159e1db3a)
Co-authored-by: Gábor Farkas <gabor.farkas@gmail.com>