chore(deps): update determinatesystems/update-flake-lock action to v25

Author: renovate[bot]

.github/workflows/update-nix-flakes.yml

@@ -24,7 +24,7 @@ jobs:
           private-key: ${{ secrets.SQUAWK_BOT_APP_PRIVATE_KEY }}
 
       - name: update flake.lock
-        uses: DeterminateSystems/update-flake-lock@v24
+        uses: DeterminateSystems/update-flake-lock@v25
         with:
           token: ${{ steps.generate-token.outputs.token }}
           commit-msg: "chore(deps): update `flake.lock`"