ci(flake): use custom token

Author: airone01

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

@@ -16,7 +16,9 @@ jobs:
       - name: Update flake.lock
         uses: DeterminateSystems/update-flake-lock@main
         with:
+          token: ${{ secrets.GH_TOKEN_FOR_UPDATES }}
           pr-title: "chore(flake): update flake.lock"
+          commit-msg: "chore(flake): update flake.lock"
           pr-labels: |
             dependencies
             automated