Fix Elixir install

[mvkvc]

Update evaluation/Dockerfile to fix Elixir install errors with solution from #117.

[arjunguha]

I see this is a draft PR. Should I just test it, or does it have a known problem?

[mvkvc]

It was because haven't been able to test it yet, spinning up a machine to do it now. If you can do it easily that would be great.

[mvkvc]

Tested that it works with make all in the evaluations/ folder.

I had to fix errors for the Julia install to get it to work which I replaced with:

RUN curl -fsSL https://install.julialang.org | sh -s -- -y --default-channel 1.8.2 -p /julia-1.8.2
ENV PATH="/julia-1.8.2/bin:${PATH}"

If you run into the same error I can submit a PR for that otherwise this should be good as is.

[arjunguha]

Works perfectly, thanks!

I'm going to try to keep benchmark results up to date with newer models. Looks like DeepSeekV2 shows significant improvement on Elixir compared to older models: https://huggingface.co/spaces/nuprl/MultiPL-E