chore(deps): bump cachix/cachix-action from 12 to 14

Bumps [cachix/cachix-action](https://github.com/cachix/cachix-action) from 12 to 14.
- [Release notes](https://github.com/cachix/cachix-action/releases)
- [Commits](cachix/cachix-action@v12...v14)

---
updated-dependencies:
- dependency-name: cachix/cachix-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/build-nix.yml

@@ -33,7 +33,7 @@ jobs:
           sudo apt install -q -y qemu-system-aarch64 qemu-efi binfmt-support qemu-user-static
           mkdir -p ~/.config/nix
           echo "system-features = aarch64-linux arm-linux" | sudo tee -a /etc/nix/nix.conf
-      - uses: cachix/cachix-action@v12
+      - uses: cachix/cachix-action@v14
         with:
           name: unblob
           authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}

.github/workflows/update-nix.yml

@@ -13,7 +13,7 @@ jobs:
         with:
           extra_nix_config: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
-      - uses: cachix/cachix-action@v12
+      - uses: cachix/cachix-action@v14
         with:
           name: unblob
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
@@ -35,7 +35,7 @@ jobs:
           nix_path: nixpkgs=channel:nixos-unstable
           extra_nix_config: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
-      - uses: cachix/cachix-action@v12
+      - uses: cachix/cachix-action@v14
         with:
           name: unblob
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"