elixir: update to 1.16.1.

Bug fixes

Elixir

    [Code] Fix Code.quoted_to_algebra/2 for operator with :do key as operand
    [Kernel.ParallelCompiler] Do not crash parallel compiler when it receives diagnostics from additional code evaluation
    [Kernel.ParallelCompiler] Always log errors at the end of compilation
    [String] Fix String.capitalize/1 with a single codepoint

IEx

    [IEx] Fix autocompletion of function signatures on Erlang/OTP 26
    [IEx] Do not assume $HOME is set

Mix

    [mix deps.compile] Handle compilation of rebar3 dependencies when rebar3 is on a path with spaces on Unix
    [mix test] Properly resolve relative paths when running tests from individual files
    [mix test] Properly resolve Windows paths when running tests from individual files

(wiz)