Fix Mix.Utils.write_json_tree!/4 spec#14345

josevalim merged 2 commits intoelixir-lang:mainelixir-lang/elixir:mainfrom

michallepicki:michal/25-03-18-fix-mix-utils-write-json-tree-specmichallepicki/elixir:michal/25-03-18-fix-mix-utils-write-json-tree-specCopy head branch name to clipboard