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>

.github/workflows/prettier.yml

@@ -16,7 +16,7 @@ jobs:
               uses: actions/checkout@v4
 
             - name: Install the Nix package manager
-              uses: cachix/install-nix-action@V27
+              uses: cachix/install-nix-action@V28
 
             - name: Checks
               run: nix run nixpkgs#nodePackages.prettier -- --check .

.github/workflows/tests.yml

@@ -28,7 +28,7 @@ jobs:
               uses: actions/checkout@v4
 
             - name: Install the Nix package manager
-              uses: cachix/install-nix-action@V27
+              uses: cachix/install-nix-action@V28
 
             - name: Run eval
               run: |