* Update dependencies
1. Remove */gradle.lockfile files
2. Run `gradle updateDependencyLocks` and commit
* Update multi-JDK testing to use simple Test task, add junit-platform-launcher to dependencies
- Don't use JvmTestSuite (we don't use another test runner, we use the same classpath)
* Add junit-platform-launcher to libs (prevent an issue where junit-engine and junit-launcher can fall out of sync)
