Add minimumReleaseAge to Renovate config

Yarn 4.17 defaults `npmMinimalAgeGate` to `1d`, so any npm version
published less than 24h ago is quarantined at the resolution step and
`yarn` exits with YN0016. Renovate had no age filter, so it regularly
proposed versions younger than the gate, breaking both the lockfile
update and CI for the whole grouped PR.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

renovate.json

@@ -1,6 +1,7 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "schedule": ["before 5am on sunday"],
+  "minimumReleaseAge": "3 days",
   "separateMajorMinor": true,
   "automergeType": "pr",
   "platformAutomerge": true,