Removed "dependencyDashboardHeader":

General MR

Summary

Removing "dependencyDashboardHeader": to allow for RENOVATE_DEPENDENCY_DASHBOARD_HEADER: "- [ ] Follow steps in [package update docs](./docs/DEVELOPMENT_MAINTENANCE.md) to upgrade the package." in Pipeline template renovate.json

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Upgrade Notices

(Include any relevant notes about upgrades here or write "N/A" if there are none)