Looks like you searched a few hours too early, someone’s having the same issue, you could press the +1 emoji on the issue I guess:
What could work as a temporary fix:
- Go to https://downgit.github.io/#/home
- Download
https://github.com/home-assistant/core/tree/0.117.6/homeassistant/components/rest - Unpack the .zip as a custom_component (unpack the files into config/custom_components/rest/)