JEP 525 – Structured Concurrency (Sixth Preview)

The current implementation is in [JEP 505](https://github.com/AloisSeckar/demos-java/blob/master/src/main/java/org/javademos/java25/jep505/StructuredConcurrencyDemo.java).

The recent https://openjdk.org/jeps/525 need new JEP 525 demo implementation and JEP 505 should be turned into a [linking class](https://github.com/AloisSeckar/demos-java/blob/master/src/main/java/org/javademos/java21/jep446/ScopedValuesDemo.java) pointing to JEP 525.

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**NOTE:** This is an **ADVANCED** task to help with. Be sure you understand the requirements. Check previous contributions with `advanced` label and ask if you have any questions or doubts before doing work that will not be helpful.