Remove Jshell and update YAML

[weeryan17]

Pull request

• [x] I have read and agreed to the code of conduct.
• [x] I have read and complied with the contributing guidelines.
• [x] What I'm implementing was assigned to me or was not being worked on and is a somewhat requested feature. For reference see our GitHub projects.
• [x] I have tested all of my changes.

Added/Changed

I removed JShellScriptEngine, and updated Simple-YAML in order for all our dependencies to actually resolve. JShellScriptEngine no longer exists, and Simple-YAML no longer has a version 1.3