We want AssertJ 4 to use and require Java 17.

This mostly means increasing the java.version Maven property to 17.

In addition, we can:

• Move the tests from assertj-core-java-17 to assertj-core and delete assertj-core-java-17
• Replace any usage of List.of, Set.of, and Map.of from Jdk11 with the corresponding JDK API and delete the org.assertj.core.test.jdk11 package