chore(deps): bump cachix/install-nix-action from V27 to 28

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from V27 to 28. This release includes the previously tagged commit.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@V27...V28)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.github/workflows/test.yml

@@ -28,7 +28,7 @@ jobs:
           - emacs_version: 29.1
             target: deploy-manual
     steps:
-    - uses: cachix/install-nix-action@V27
+    - uses: cachix/install-nix-action@V28
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - uses: purcell/setup-emacs@master