should this use `export-dependencies` and `--cache-tarballs`

[despairblue]

I found that those combined are smaller than the .esy folder. Which can get too big and lead to cache misses. E.g. I have projects where that folder is multiple GB and the cache can only take 5GB leading to common cache evictions with a lot of PRs.

Also it seems that that is the recommended way of caching documented in actions/cache: https://github.com/actions/cache/blob/main/examples.md#ocamlreason---esy

If this is on purpose than this issue will just document the intention for others that may be wondering.

Thanks for creating the action :)