chore(deps): Bump cachix/install-nix-action from 29 to 30

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 29 to 30.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@v29...v30)

---
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]>

.github/workflows/nix.yml

@@ -8,7 +8,7 @@ jobs:
  runs-on: ubuntu-latest
  steps:
  - uses: actions/checkout@v4
- - uses: cachix/install-nix-action@v29
+ - uses: cachix/install-nix-action@v30
  with:
  nix_path: nixpkgs=channel:nixos-unstable
  extra_nix_config: |