Update renovate.json

General MR

Summary

Remove dependencyDashboardHeader from renovate.json. This is now a variable populated from the renovate.yaml pipeline template.

Relevant logs/screenshots

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Linked Issue

issue

Upgrade Notices

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renovate.json

@@ -2,7 +2,6 @@
   "baseBranches": ["main"],
   "configWarningReuseIssue": false,
   "dependencyDashboard": "true",
-  "dependencyDashboardHeader": "- [ ] Sync upstream helm chart version with updated dependencies.",
   "dependencyDashboardTitle": "Renovate: Upgrade Gitlab Runner Package Dependencies",
   "draftPR": true,
   "enabledManagers": ["regex", "helmv3"],