feat: upgrade to jackc/pgx/v5 #1875

Job	Run time
Generate SDKs	3m 27s
Run OIDC conformity tests	8m 9s
Run tests and lints	17m 6s
Run end-to-end tests (memory)	5m 21s
Run HSM tests	7m 12s
Run end-to-end tests (memory, --jwt)	5m 4s
Run end-to-end tests (postgres)	4m 59s
Run end-to-end tests (postgres, --jwt)	4m 55s
Run end-to-end tests (mysql)	5m 6s
Run end-to-end tests (mysql, --jwt)	5m 19s
Run end-to-end tests (cockroach)	5m 17s
Run end-to-end tests (cockroach, --jwt)	5m 40s
Build CLI docs	58s
Generate changelog	0s
Generate release	0s
Render version schema	0s
Draft newsletter	0s
Release SDKs	0s
Pending approval Slack notification	0s
Send newsletter	0s
	1h 18m 33s

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