ci: bump cachix/install-nix-action from 21 to 22 (#46)

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 21 to 22.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](https://github.com/cachix/install-nix-action/compare/v21...v22)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
-      - uses: cachix/install-nix-action@v21
+      - uses: cachix/install-nix-action@v22
       - name: Check ${{ matrix.check }}
         # Depends on nixos/nix#7759 to simply `nix flake check`
         run: nix run .#checks.$(nix eval --raw --impure --expr "builtins.currentSystem").${{ matrix.check }}
@@ -46,7 +46,7 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v3
     - name: Install nix
-      uses: cachix/install-nix-action@v21
+      uses: cachix/install-nix-action@v22
     - name: Show nixpkgs version
       run: nix eval --impure --expr '(import ./flake-compat.nix { src = ./.; }).lib.version'
     - name: Setup cachix

.github/workflows/update.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
-      - uses: cachix/install-nix-action@v21
+      - uses: cachix/install-nix-action@v22
         with:
           extra_nix_config: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}