Update update-flake-lock.yml

Author: andreabedini

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

@@ -12,9 +12,12 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v3
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v1
+        uses: DeterminateSystems/nix-installer-action@v3
+        with:
+          extra-conf: |
+            accept-flake-config=true
       - name: Update flake.lock
-        uses: DeterminateSystems/update-flake-lock@v18
+        uses: DeterminateSystems/update-flake-lock@v19
         with:
           inputs: hackage-nix CHaP
           pr-labels: |