heroku: remove peterhoeg as maintainer

pkgs/development/tools/heroku/default.nix

@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
   meta = {
     homepage = "https://devcenter.heroku.com/articles/heroku-cli";
     description = "Everything you need to get started using Heroku";
-    maintainers = with lib.maintainers; [ aflatter mirdhyn peterhoeg marsam ];
+    maintainers = with lib.maintainers; [ aflatter mirdhyn marsam ];
     license = lib.licenses.mit;
     platforms = with lib.platforms; unix;
   };