chore(renovate): Add dependencies labels.

Author: Codex-

.github/renovate.json

@@ -2,6 +2,7 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": ["config:base", ":preserveSemverRanges"],
   "timezone": "Pacific/Auckland",
+  "labels": ["dependencies"],
   "vulnerabilityAlerts": {
     "labels": ["security"],
     "automerge": true,