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

https://github.com/freshprince/void-packages synapse-1.19.0
https://github.com/void-linux/void-packages/pull/24340

fix dependency for synapse-1.19.0.
2994314a3f08152905ce80d78ad2f86eeda43fb3 broke synapse because the new version depended on a newer version of `canonicaljson`.  (please test before pushing.)  this version-bumps `canonicaljson` to the newest release and marks the version in `depends` in synapse.

A patch file from https://github.com/void-linux/void-packages/pull/24340.patch is attached