Bump cachix/install-nix-action from 13 to 14.1

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 13 to 14.1.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](https://github.com/cachix/install-nix-action/compare/v13...v14.1

)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/nix.yml

@@ -46,7 +46,7 @@ jobs:
     - uses: actions/checkout@v2
       with:
         submodules: true
-    - uses: cachix/install-nix-action@v13
+    - uses: cachix/install-nix-action@v14.1
       with:
         install_url: https://nixos-nix-install-tests.cachix.org/serve/i6laym9jw3wg9mw6ncyrk6gjx4l34vvx/install
         install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
@@ -81,7 +81,7 @@ jobs:
     - uses: actions/checkout@v2
       with:
         submodules: true
-    - uses: cachix/install-nix-action@v13
+    - uses: cachix/install-nix-action@v14.1
       with:
         install_url: https://nixos-nix-install-tests.cachix.org/serve/i6laym9jw3wg9mw6ncyrk6gjx4l34vvx/install
         install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'