chore: update actions-cache to v4 #2235

Job	Run time
Run OIDC conformity tests	5m 40s
Generate SDKs	3m 30s
Run HSM tests	2m 4s
Run end-to-end tests (memory)	2m 5s
Run end-to-end tests (memory, --jwt)	2m 4s
Run end-to-end tests (postgres)	2m 5s
Run end-to-end tests (postgres, --jwt)	2m 5s
Run tests and lints	2m 5s
Run end-to-end tests (mysql)	2m 4s
Run end-to-end tests (mysql, --jwt)	2m 4s
Run end-to-end tests (cockroach)	2m 4s
Run end-to-end tests (cockroach, --jwt)	2m 5s
Build CLI docs	1s
Generate changelog	1s
Generate release	1s
Draft newsletter	1s
Render version schema	1s
Release SDKs	1s
Send newsletter	1s
Pending approval Slack notification	1s
	30m 3s

Provide feedback