Merge pull request #133 from Artturin/nixciupdate

workflows/test.yml use macos-latest again and use nix release with

.github/workflows/test.yml

@@ -97,7 +97,7 @@ jobs:
   oldest-supported-installer:
     strategy:
         matrix:
-          os: [ubuntu-latest, macos-10.15]
+          os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v3
@@ -107,7 +107,7 @@ jobs:
       uses: ./
       with:
         nix_path: nixpkgs=channel:nixos-21.05
-        install_url: https://releases.nixos.org/nix/nix-2.3.5/install
+        install_url: https://releases.nixos.org/nix/nix-2.3.8/install
     - run: nix-build test.nix
 
   act-support: