chore(deps): bump cachix/install-nix-action from 27 to 28

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 27 to 28.
- [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
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/nix.yml

@@ -12,7 +12,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           submodules: true
-      - uses: cachix/install-nix-action@v27
+      - uses: cachix/install-nix-action@V28
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - run: nix develop -c dune build @runtest @check