coursier: patch shebang to make it work in the nix sandboxes

Before `/usr/bin/env sh` was in the script.

pkgs/development/tools/coursier/default.nix

···
 
   buildCommand = ''
     install -Dm555 $src $out/bin/coursier
+    patchShebangs $out/bin/coursier
     wrapProgram $out/bin/coursier --prefix PATH ":" ${jre}/bin
   '';