chore: update actions-cache to v4 #2236

Job	Run time
Run OIDC conformity tests	9m 20s
Generate SDKs	3m 28s
Run HSM tests	7m 58s
Run tests and lints	19m 17s
Run end-to-end tests (memory)	5m 7s
Run end-to-end tests (memory, --jwt)	5m 2s
Run end-to-end tests (postgres)	5m 4s
Run end-to-end tests (postgres, --jwt)	5m 12s
Run end-to-end tests (mysql)	5m 4s
Run end-to-end tests (mysql, --jwt)	5m 14s
Run end-to-end tests (cockroach)	5m 30s
Run end-to-end tests (cockroach, --jwt)	5m 39s
Build CLI docs	1m 0s
Generate changelog	0s
Generate release	0s
Draft newsletter	0s
Render version schema	0s
Release SDKs	0s
Send newsletter	0s
Pending approval Slack notification	0s
	1h 22m 55s

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