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

https://github.com/leahneukirchen/void-packages ruby27
https://github.com/void-linux/void-packages/pull/20574

Ruby 2.7
Not tested.  Vagrant should print warnings but work (Arch would have a patch).

A patch file from https://github.com/void-linux/void-packages/pull/20574.patch is attached