chore: Use dapr-bot to create backport PRs, so they can trigger workflows (#931)

Signed-off-by: Albert Callarisa <albert@diagrid.io>

Author: acroca

.github/workflows/backport.yaml

@@ -34,4 +34,4 @@ jobs:
     steps:
       - uses: tibdex/backport@9565281eda0731b1d20c4025c43339fb0a23812e
         with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
+          github_token: ${{ secrets.DAPR_BOT_TOKEN }}