There's a closed pull request on the void-packages repository

sway: update to 1.1+rc1.
https://github.com/void-linux/void-packages/pull/11476
Description: This is a release candidate, but package maintainers have not been instructed not to package this release as the developers did for the old ones.
It is up to you to decide if you want to add this version to void repositories (if the template is correct) or not ;)