Revert "make function private"

This reverts commit 27443d4.

Author: lukaszsamson

apps/language_server/lib/language_server/build.ex

@@ -112,7 +112,7 @@ defmodule ElixirLS.LanguageServer.Build do
   # it was added in https://github.com/elixir-lsp/elixir-ls/pull/227
   # removing it doesn't break tests and I'm not able to reproduce
   # https://github.com/elixir-lsp/elixir-ls/issues/209 on recent elixir (1.13)
-  defp load_all_mix_applications do
+  def load_all_mix_applications do
     apps =
       cond do
         Mix.Project.umbrella?() ->