use the same nixpkgs as flake

Author: josheppinette

.github/workflows/pre-commit.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - uses: DeterminateSystems/nix-installer-action@v21
-      - run: nix profile install nixpkgs#direnv
+      - run: nix profile install nixpkgs/nixos-25.11#direnv
       - run: |
           direnv allow
           direnv export gha >> "$GITHUB_ENV"