Merge pull request #45 from nix-community/dependabot/github_actions/cachix/install-nix-action-18

build(deps): bump cachix/install-nix-action from 17 to 18

.github/workflows/nix.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
-      - uses: cachix/install-nix-action@v17
+      - uses: cachix/install-nix-action@v18
       - run: nix-shell --run ./ci.sh
         env:
           CI_REGISTRY_AUTH: '${{ secrets.REGISTRY_AUTH }}'