chore: Fix elixir release workflow

[bhelx]

No description provided.

[bhelx]

Kind of hacky, but seems to be working now: https://github.com/extism/extism/actions/runs/3472085858/jobs/5802438473

failing to republish the same version

[nilslice]

I see -- so the publish step doesn't need the underlying .so so it still triggers this warning:

Warning: {:error,
 {:load_failed,
  'Failed to load NIF library /home/runner/work/extism/extism/elixir/_build/dev/lib/extism/priv/native/libextism_nif: \'libextism.so: cannot open shared object file: No such file or directory\''}}