Log Message:
lang/elixir: Update to 1.6.5.

- [Code] Preserve the user's choice in the formatter on parens call
  with next break fits
- [Code] Preserve the user's choice in the formatter on calls without
  parens when we have one argument per line
- [Code] Fix formatting when there is a tilde in the first element of
  a bitstring
- [Kernel] Support specsdiff flag on __info__ spec clauses
- [Kernel] Do not exclude hygienic vars in defguard
- [Kernel.SpecialForms] Mark for comprehensions as generated to avoid
  dialyzer warnings
- [Macro] Make sure Macro.to_string/2 emits valid quoted expressions
- [Task] Support :infinity timeout on Task.yield_many/2
- [Task.Supervisor] Do not crash spawning supervised tasks when the
  parent process is dead
- [URI] Fix parsing of URIs with trailing ?