build(deps): bump cachix/install-nix-action from 24 to 25

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 24 to 25.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@v24...v25)

---
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>

.github/workflows/ci.yml

@@ -95,7 +95,7 @@ jobs:
       - uses: actions/checkout@v4
 
       # Install Nix and set up Cachix
-      - uses: cachix/install-nix-action@v24
+      - uses: cachix/install-nix-action@v25
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - uses: cachix/cachix-action@v13