rebase + cleanup flake.nix

Author: Vincent Siles

flake.nix

@@ -6,7 +6,6 @@
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
-      inputs.flake-utils.follows = "flake-utils";
     };
     advisory-db = {
       url = "github:rustsec/advisory-db";