build(deps): bump cachix/install-nix-action from v12 to v13

dependabot[bot] · web-flow · commit 5bf5dee4f5b5 · 2021-04-05T06:22:25.000Z
Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from v12 to v13. - [Release notes](https://github.com/cachix/install-nix-action/releases) - [Commits](cachix/install-nix-action@v12...8d6d5e9) Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v12
+    - uses: cachix/install-nix-action@v13
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - name: Show nixpkgs version
