Build the Minecraft plugin project I uploaded.
Requirements:
* Build the complete project using Maven.
* Use Java 21.
* Make sure all dependencies are downloaded correctly.
* Fix only compilation/build errors that prevent the project from building.
* Do not remove or change any plugin features.
* Do not rewrite the plugin unnecessarily.
* Make sure `plugin.yml` is included correctly.
* After a successful build, provide the final compiled `.jar` file.
* The final JAR must be ready to place directly into the server's `plugins` folder.
* Also tell me if the build succeeds or fails and show any important build errors if it fails.
