WICKET-6858 Add some more opens for the new StringsTest
WICKET-6858 Add some more opens for the new StringsTest

JDK 16 b28 requires them

apache/wicket,mosoft521/wicket,mosoft521/wicket,apache/wicket,mosoft521/wicket,mosoft521/wicket,apache/wicket,mosoft521/wicket,apache/wicket,apache/wicket