Bump DeterminateSystems/update-flake-lock from 24 to 25 (#2011)

Author: dependabot[bot]

.github/workflows/update-hydra-spec.yaml

@@ -13,7 +13,7 @@ jobs:
       - name: Install Nix
         uses: cachix/install-nix-action@v31
       - name: Update flake.lock
-        uses: DeterminateSystems/update-flake-lock@v24
+        uses: DeterminateSystems/update-flake-lock@v25
         with:
           inputs: hydra-spec
           token: ${{ secrets.GH_TOKEN_FOR_UPDATES }}