Bump cachix/install-nix-action from 23 to 24 (#91)

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 23 to 24.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](https://github.com/cachix/install-nix-action/compare/v23...v24)

---
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/cachix.yml

@@ -15,10 +15,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - uses: cachix/install-nix-action@v23
+    - uses: cachix/install-nix-action@v24
       with:
         nix_path: nixpkgs=channel:nixos-unstable
-    - uses: cachix/cachix-action@v12
+    - uses: cachix/cachix-action@v13
       with:
         name: davegallant
         authToken: '${{ secrets.CACHIX_API_KEY }}'