Update peter-evans/repository-dispatch action to v4

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -35,7 +35,7 @@ jobs:
     - name: Notify manageiq.github.io on Push
       if: "${{ github.event_name == 'push' && github.repository_owner == 'ManageIQ'
         }}"
-      uses: peter-evans/repository-dispatch@v3
+      uses: peter-evans/repository-dispatch@v4
       with:
         token: "${{ secrets.WEBSITE_DEPLOY_TOKEN }}"
         repository: ManageIQ/manageiq.github.io