ci: adjust update-flake-lock.yaml for token

Author: srid

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

@@ -11,14 +11,12 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Install Nix
-        uses: cachix/install-nix-action@v17
-        with:
-          extra_nix_config: |
-            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+        uses: DeterminateSystems/nix-installer-action@main
       - name: Update flake.lock
         uses: DeterminateSystems/update-flake-lock@main
         with:
-          pr-title: "Update flake.lock" # Title of PR to be created
-          pr-labels: |                  # Labels to be set on the PR
+          token: ${{ secrets.GH_TOKEN_FOR_UPDATES }}
+          pr-title: "Update example/flake.lock"
+          pr-labels: |
             automated
           path-to-flake-dir: 'example/'