Fix regression tests to work with REGRESS_OPTS=--no-locale

When Who What
2023-07-03 23:20:45 Michael Paquier (michael-kun) Closed in commitfest 2023-07 with status: Committed
2023-07-03 23:20:45 Michael Paquier (michael-kun) Changed committer to michael-kun
2023-07-03 06:48:36 Peter Eisentraut (petere) New status: Ready for Committer
2023-07-03 06:48:30 Peter Eisentraut (petere) Added petere as reviewer
2023-06-15 22:47:36 Michael Paquier (michael-kun) Changed authors to Michael Paquier (michael-kun)
2023-06-15 22:47:27 Michael Paquier (michael-kun) Attached mail thread ZIq1HUnIV2ksW85x@paquier.xyz
2023-06-15 22:47:27 Michael Paquier (michael-kun) Created patch record