Fix future lint issue

This hit me we I tried to update to nixpkgs 24.05. IMHO it's an improvement anyways.

The linter message was:

statix...................................................................Failed
- hook id: statix
- exit code: 1

./flake.nix>23:7:W:20:The key `inputs` is first assigned here ...
./flake.nix>24:7:W:20:... repeated here ...
./flake.nix>25:7:W:20:... and here. Try `inputs = { nixpkgs.follows=...; nixpkgs-stable.follows=...; flake-compat.follows=...; }` instead.