build(deps): bump cachix/install-nix-action from V27 to 30

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from V27 to 30. This release includes the previously tagged commit.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@V27...v30)

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

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

.github/workflows/ci.yml

@@ -81,7 +81,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4.2.1
-      - uses: cachix/install-nix-action@V27
+      - uses: cachix/install-nix-action@v30
       - uses: cachix/cachix-action@v15
         with:
           name: linz