feat: upgrade to jackc/pgx/v5 #1877

Job	Run time
Generate SDKs	3m 32s
Run OIDC conformity tests	8m 34s
Run HSM tests	6m 10s
Run tests and lints	14m 7s
Run end-to-end tests (memory)	4m 47s
Run end-to-end tests (memory, --jwt)	4m 53s
Run end-to-end tests (postgres)	4m 57s
Run end-to-end tests (postgres, --jwt)	4m 51s
Run end-to-end tests (mysql)	4m 59s
Run end-to-end tests (mysql, --jwt)	5m 9s
Run end-to-end tests (cockroach)	5m 14s
Run end-to-end tests (cockroach, --jwt)	5m 31s
Build CLI docs	55s
Generate changelog	0s
Generate release	0s
Draft newsletter	0s
Render version schema	0s
Release SDKs	0s
Pending approval Slack notification	0s
Send newsletter	0s
	1h 13m 39s

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