The previous attempt to set the minimal Java version to 8 (!33) turned up to be incorrect, as it configured the Kotlin convention plugin from the Playground, which is actually unused by this repository. The repository also uses `Path.of` in multiple places, which was introduced in Java 11, so in the current state we cannot be compatible with Java 8. It's unclear at the moment whether Java 8 support is important enough to refactor this; Kobweb supports Java 11 at the earliest. This MR properly configures Gradle to advertise that the binaries are compatible with Java 11. Closes #36 See merge request opensavvy/automation/kotlin-vite!37