There is a new pull request by jnbr against master on the void-packages repository

https://github.com/jnbr/void-packages prompt_toolkit
https://github.com/void-linux/void-packages/pull/12637

python3-ipython: add replaces python3-prompt_toolkit1.
This package was switched from `python3-prompt_toolkit1` to conflicting package 
`python3-prompt_toolkit2`.
Adding `replaces="python-prompt_toolkit1>=0"` allows to update systems with this package installed again.

fixes #12636

A patch file from https://github.com/void-linux/void-packages/pull/12637.patch is attached