Log Message:
elixir: update to 1.12.3

This release contains only bug fixes:

Elixir

     * [Code] Make sure that bindings in the default context returned by
       Code.eval_* functions are not returned as tagged tuples
     * [Kernel] Do not crash when handling ambiguity errors
     * [Range] Still match on old range patterns throughout the stdlib

IEx

     * [IEx.Autocomplete] Do not error autocompletion with module
       attribute

Mix

     * [Mix] Rename inconsistent :exit_code option to :exit_status on
       Mix.raise/2