* [jsscriptingnashorn] JavaScript Scripting Nashorn Automation
This add-on allows you to use your older JavaScript (ECMAScript 5.1) rules on newer Java versions until they are migrated to JavaScript (ECMAScript 2021+).
The add-on uses a standalone [Nashorn Engine](https://github.com/openjdk/nashorn) which was part of Java until it was removed in Java 15.
* Update parent to 3.4.0-SNAPSHOT and nashorn-core to 15.4
For the Nashorn changelog, see:
https://github.com/openjdk/nashorn/blob/main/CHANGELOG.md
* Update parent to 4.0.0-SNAPSHOT
* Remove removeUnsupportedNashornArgs
* Update scriptTypes
* Add CODEOWNERS entry
* Recycle ScriptScopeOSGiTest.java
It got removed in openhab/openhab-core#2994
* Remove redundant new line from pom.xml
Signed-off-by: Wouter Born <github@maindrain.net>