fix: add "form_post" to list of supported response modes #1681

Job	Run time
Run OIDC conformity tests	9m 9s
Generate SDKs	1m 15s
Run end-to-end tests (memory)	5m 4s
Run end-to-end tests (memory, --jwt)	5m 4s
Run HSM tests	4m 52s
Run end-to-end tests (postgres)	4m 53s
Run end-to-end tests (postgres, --jwt)	5m 2s
Run tests and lints	6m 30s
Run end-to-end tests (mysql)	5m 17s
Run end-to-end tests (mysql, --jwt)	5m 6s
Run end-to-end tests (cockroach)	5m 9s
Run end-to-end tests (cockroach, --jwt)	5m 29s
Build CLI docs	0s
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 2m 50s

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