Enable automerge for lock file maintenance PRs

Lock file maintenance was configured to run weekly via :maintainLockFilesWeekly,
but these PRs were not being automerged. This adds automerge: true to the
lockFileMaintenance config so that weekly lock file updates will automatically
merge after CI passes, reducing manual maintenance overhead.

Author: ErisDS

quiet.json5

@@ -34,6 +34,10 @@
     "postUpdateOptions": [
         "yarnDedupeHighest"
     ],
+    // Automerge lock file maintenance PRs
+    "lockFileMaintenance": {
+        "automerge": true
+    },
     // Custom packages rules, which extend the configuration above
     "packageRules": [
         // Always require dashboard approval for major updates