There is an updated pull request by Piraty against master on the void-packages repository

https://github.com/Piraty/void-packages nettle-3.6
https://github.com/void-linux/void-packages/pull/21805

nettle: update to 3.6. 
build takes long

- [x] x86_64 (native)
- [x] aarch64-musl (cross)
- [x] armv7l (cross)

A patch file from https://github.com/void-linux/void-packages/pull/21805.patch is attached