Fix Java 17 compilation and test issues (#12353)

* Adds --add-opens to the surefire-maven-plugin config required for deserialization using Gson/XStream
* Upgrades plugin dependencies to JDK 17 compatible versions
* Replaces some reflection that no longer works on JDK 17
* Fixes issues when mocking Random
* Run Nashorn dependant tests only on JDK < 15

Signed-off-by: Wouter Born <github@maindrain.net>

bundles/org.openhab.io.hueemulation/src/test/java/org/openhab/io/hueemulation/internal/rest/ScheduleTests.java

@@ -89,7 +89,7 @@ public class ScheduleTests {
         commonSetup.start(new ResourceConfig().registerInstances(subject));
 
         // Mock random -> always return int=10 or the highest possible int if bounded
-        Random random = mock(Random.class);
+        Random random = mock(Random.class, withSettings().withoutAnnotations());
         doReturn(10).when(random).nextInt();
         doAnswer(a -> {
             Integer bound = a.getArgument(0);