Elixir doesn't work with asdf-exec

Using `iex -S mix` shows the following:

```
Erlang/OTP 24 [erts-12.3.1] [source] [64-bit] [smp:64:64] [ds:64:64:10] [async-threads:1] [jit]

** (SyntaxError) /home/josh/.asdf/shims/mix:3:17: syntax error before: '.'
|
3 | exec /home/josh/.asdf/bin/private/asdf-exec "mix" "$@"
| ^
(elixir 1.13.3) lib/code.ex:1183: Code.require_file/2
```

Reproduce:
1/ Use asdf (0.10.0/0.9.0)
2/ Use asdf-exec
3/ Use erlang/elixir (doesn't matter the specific versions)
4/ The above shows