Update peter-evans/repository-dispatch action to v4

Author: renovate-sh-app[bot]

.github/workflows/notify-plugin-tools.yml

@@ -54,7 +54,7 @@ jobs:
 
       - name: Repository Dispatch
         if: steps.check_files.outputs.has_relevant_changes == 'true'
-        uses: peter-evans/repository-dispatch@ff45666b9427631e3450c54a1bcbee4d9ff4d7c0 # v3.0.0
+        uses: peter-evans/repository-dispatch@5fc4efd1a4797ddb68ffd0714a238564e4cc0e6f # v4.0.0
         with:
           token: ${{ steps.generate_token.outputs.token }}
           repository: grafana/plugin-tools