fix(ci): bump nix version for actions

Author: bryango

.github/workflows/build.yml

@@ -22,7 +22,7 @@ jobs:
     - uses: cachix/install-nix-action@v22
       with:
         nix_path: nixpkgs=channel:nixpkgs-unstable
-        install_url: https://releases.nixos.org/nix/nix-2.24.12/install
+        install_url: https://releases.nixos.org/nix/nix-2.28.2/install
         extra_nix_config: |
           experimental-features = nix-command flakes fetch-closure configurable-impure-env
           impure-env = GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }}