elixir: Update to 1.11.2

Elixir

    [Code] Do not crash when getting docs for missing erts appdir
    [Kernel] Raise meaningful error if :erlang.is_record is used in guards
    [Kernel] Prune tracers when fetching __ENV__ inside functions

Mix

    [mix] Fix regression where aliases could not call themselves recursively
    [mix compile] Do not discard tracers that are set programmatically

(nia)