chore(deps): bump cachix/install-nix-action from V28 to 29

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from V28 to 29. This release includes the previously tagged commit.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@V28...v29)

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

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

.github/workflows/ci.yaml

@@ -12,7 +12,7 @@ jobs:
                   submodules: recursive
 
             - name: install nix
-              uses: cachix/install-nix-action@V28
+              uses: cachix/install-nix-action@v29
               with:
                   install_url: https://nixos.org/nix/install
                   extra_nix_config: |