chore(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] <[email protected]>

.github/workflows/ci.yml

@@ -63,7 +63,7 @@ jobs:
         solc-select use 0.5.7 --always-install
     - name: Set up nix
       if: matrix.type == 'dapp'
-      uses: cachix/install-nix-action@V27
+      uses: cachix/install-nix-action@v30
     - name: Set up cachix
       if: matrix.type == 'dapp'
       uses: cachix/cachix-action@v15