build(deps): bump cachix/install-nix-action from 23 to 25

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 23 to 25.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@v23...v25)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci.yaml

@@ -35,7 +35,7 @@ jobs:
           echo ::set-output name=short::$(git rev-parse --short HEAD)
 
       - name: Install nix
-        uses: cachix/install-nix-action@v23
+        uses: cachix/install-nix-action@v25
         with:
           nix_path: nixpkgs=channel:nixos-unstable