Create image for elixir 1.13-slim with Erlang 23

[santoshturamari]

Hello,

We want to upgrade to Elixir 1.13 version with Erlang 23, as there is a requirement.
But related to this version combination, there is no official image available in https://hub.docker.com/_/elixir
Hence, please create this image?

@duksis

Thanks & Regards,
Santosh T

[getong]

You might make a PR, I does not write elixir code recently, and I feel uncertainly with it.

[santoshturamari]

I have created a PR for the change.