Update rebase.yml with workflows permissions (#5255)

.github/workflows/rebase.yml

@@ -13,9 +13,9 @@ jobs:
       - name: Checkout the latest code
         uses: actions/checkout@v2
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
+          token: ${{ secrets.ACTIONS_TOKEN }}
           fetch-depth: 0 # otherwise, you will fail to push refs to dest repo
       - name: Automatic Rebase
         uses: cirrus-actions/rebase@1.5
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.ACTIONS_TOKEN }}