ci: Remove token

Author: srid

.github/workflows/update-flake-lock.yaml

@@ -15,7 +15,6 @@ jobs:
       - name: Update flake.lock
         uses: DeterminateSystems/update-flake-lock@main
         with:
-          token: ${{ secrets.GH_TOKEN_FOR_UPDATES }}
           pr-title: "Update example/flake.lock"
           pr-labels: |
             automated