Upgrading the version of zinc incremental scala compiler plugin, is far a good idea, since we already have an issue related to zinc probably every Gradle version upgrade since much older versions,
From the current version 1.8.0 to version 1.9.2 there may be some enhancements there is much improvements and dependency upgrades
Check this link :
https://github.com/sbt/zinc/compare/v1.8.0...v1.9.2
This upgrade is too minor, and consists only on changing the version if zinc, it can be tricky since it's related to the building process and needs to be sure every things is working well, and no regression will be caused on build process