chore(deps): update actions/checkout digest to df4cb1c

Author: renovate[bot]

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
         with:
           name: packer-kubernetes-hcloud
           authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
       - run: nix build '.#nixosConfigurations.hcloud-kubernetes.config.system.build.toplevel'
   build-arm64:
     runs-on: ubuntu-24.04-arm
@@ -29,5 +29,5 @@ jobs:
         with:
           name: packer-kubernetes-hcloud
           authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
       - run: nix build '.#nixosConfigurations.install-image-orangepi5plus.config.system.build.toplevel'