Remove unneeded deps

[rukai]

• rand_distr is not needed since rand provides the same functionality now
• The num crate is a meta crate that just reexports num-bigint and some other crates. We can just use num-bigint directly to avoid pulling in all the other crates which we dont need.

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #1713 will not alter performance

_{Comparing rukai:remove_unneeded_deps (129234d) with main (fe68350)}

Summary

✅ 39 untouched benchmarks