renovate: move cron to Sat 02:00 Europe/Budapest

Was Sun 04:00; now Sat 02:00 so Renovate's wave lands at the start of
the weekend instead of the end. If an auto-merged update breaks
something, Viktor has the full weekend to troubleshoot.

`0 2 * * 6` = Saturday 02:00 in Europe/Budapest (the CronJob already
sets timeZone, so this is wall-clock local).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

admin-system/renovate.yaml

@@ -6,7 +6,7 @@
 #        -slim suffix was retired after v37.440.x, so we pin the plain tag)
 #
 # PILOT SCOPE (intentionally narrow):
-#   Runs weekly (Sun 04:00 Europe/Budapest) as a CronJob and opens
+#   Runs weekly (Sat 02:00 Europe/Budapest) as a CronJob and opens
 #   dependency-update PRs against admin/homelab-manifests on Gitea.
 #   Only the `kubernetes` and `helm-values` managers are enabled, and a
 #   default-deny packageRule limits updates to exactly four pilot images:
@@ -116,7 +116,9 @@ metadata:
     app.kubernetes.io/name: renovate
     app.kubernetes.io/version: "43.197.0"
 spec:
-  schedule: "0 4 * * 0"
+  # Sat 02:00 Europe/Budapest — leaves the full weekend for troubleshooting
+  # if a Renovate-merged update breaks something.
+  schedule: "0 2 * * 6"
   timeZone: "Europe/Budapest"
   concurrencyPolicy: Forbid
   successfulJobsHistoryLimit: 3