add --no-sync to pg_upgrade's calls to pg_dump and pg_dumpall

When Who What
2024-07-01 15:23:14 Nathan Bossart (bossartn) Closed in commitfest 2024-07 with status: Committed
2024-05-08 14:06:59 Nathan Bossart (bossartn) Added bossartn as committer
2024-05-08 14:06:56 Nathan Bossart (bossartn) New status: Ready for Committer
2024-05-03 17:15:25 Nathan Bossart (bossartn) Changed authors to Nathan Bossart (bossartn)
2024-05-03 17:15:25 Nathan Bossart (bossartn) Changed targetversion to 18
2024-05-03 17:15:20 Nathan Bossart (bossartn) Attached mail thread 20240503171348.GA1731524@nathanxps13
2024-05-03 17:15:20 Nathan Bossart (bossartn) Created patch record