build: remove magic cache

Author: josheppinette

.github/workflows/pre-commit.yml

@@ -11,7 +11,6 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - uses: DeterminateSystems/nix-installer-action@v21
-      - uses: DeterminateSystems/magic-nix-cache-action@v12
       - run: nix profile install nixpkgs#direnv
       - run: |
           direnv allow