Navigation leads user to the elixir stdlib but user can't navigate the stdlib

### Environment

* Elixir & Erlang versions (elixir --version): 1.13.4
* Elixir Language Server version: v0.11.0
* Operating system: macOS 12.4
* Editor or IDE name (e.g. Emacs/VSCode): VSCode
* Editor Plugin/LSP Client name and version: ElixirLS v0.11.0

### Current behavior

* Open file containing `IO.puts("")`
* ctrl-click on _puts_, navigate to the io.ex file from the stdlib
```
...
def puts(device \\ :stdio, item) when is_device(device) do
:io.put_chars(map_dev(device), [to_chardata(item), ?\n])
end
...
```
* Try to ctrl-click on `:io.put_chars` or `map_dev` but it does nothing

### Expected behavior

* Open file containing `IO.puts("")`
* ctrl-click on _puts_, navigate to the io.ex file from the stdlib
```
...
def puts(device \\ :stdio, item) when is_device(device) do
:io.put_chars(map_dev(device), [to_chardata(item), ?\n])
end
...
```
* ctrl-click on `:io.put_chars` should lead to the erlang implementation; ctrl-click on `map_dev` should lead you to the implementation on io.ex