docs: add PGRST123 to error table #3287

Job	Run time
Release / Docker Hub Description	0s
Build / Cabal - aarch64 GHC 9.4.8	5m 45s
Build / Nix - MacOS	3m 37s
Build / Nix - Linux static	42s
Build / Stack - Linux	2m 5s
Build / Stack - MacOS	4m 8s
Build / Cabal - Linux GHC 9.6.4	2m 37s
Build / Stack - Windows	17m 50s
Check / Lint & Style	1m 26s
Build / Cabal - Linux GHC 9.8.2	48s
Build / Stack - FreeBSD from CirrusCI	5m 37s
Docs / Build	39s
Test / Coverage	6m 16s
Test / Loadtest	5m 20s
Docs / Spellcheck	38s
Test / Memory	1m 41s
Test / PG 12	5m 19s
Test / PG 13	5m 13s
Test / PG 14	5m 22s
Test / PG 15	5m 18s
Test / PG 16	5m 8s
Release / Tag	0s
Release / Prepare	0s
Release / Docker Hub	0s
Release / GitHub	0s
Release / Docker Hub Arm	0s
Build / Cleanup	9s
	1h 25m 38s

Provide feedback