feat: upgrade to jackc/pgx/v5 #1876

Job	Run time
Run OIDC conformity tests	10m 10s
Generate SDKs	3m 34s
Run tests and lints	6m 31s
Run HSM tests	6m 16s
Run end-to-end tests (memory)	4m 58s
Run end-to-end tests (memory, --jwt)	5m 52s
Run end-to-end tests (postgres)	5m 5s
Run end-to-end tests (postgres, --jwt)	5m 11s
Run end-to-end tests (mysql)	5m 40s
Run end-to-end tests (mysql, --jwt)	5m 40s
Run end-to-end tests (cockroach)	5m 35s
Run end-to-end tests (cockroach, --jwt)	5m 31s
Build CLI docs	1s
Generate changelog	1s
Generate release	1s
Draft newsletter	1s
Render version schema	1s
Release SDKs	1s
Pending approval Slack notification	1s
Send newsletter	1s
	1h 10m 11s

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