chore(renovate): add label for renovate PR (#1070)

<!-- For Coveo Employees only. Fill this section.

CDX-227

-->

## Proposed changes

Add a label on renovate PR so we see them at a glance

renovate.json

@@ -4,6 +4,7 @@
     ":semanticPrefixFixDepsChoreOthers",
     "helpers:pinGitHubActionDigests"
   ],
+  "labels": ["dependencies"],
   "schedule": ["before 2am"],
   "vulnerabilityAlerts": {
     "commitMessageSuffix": "[SECURITY] J:CDX-227"