Remove magic nix cache :(

Author: camelpunch

.github/workflows/pipeline.yml

@@ -22,7 +22,6 @@ jobs:
             deps
             _build
       - uses: DeterminateSystems/nix-installer-action@main
-      - uses: DeterminateSystems/magic-nix-cache-action@main
       - run: |
           mix do deps.get
           mix dialyzer