use get(0) instead of new jdk built in getFirst

Author: Hà Trung Kiên

hibernate-core/src/test/java/org/hibernate/orm/test/annotations/beanvalidation/LazyPropertiesFetchTest.java

@@ -84,7 +84,7 @@ void testLazyCollectionFetchDoesntDependOnEachOther(SessionFactoryScope scope) {
 			MutableEntity fetched = session.find( MutableEntity.class, 2L );
 			inspector.assertExecutedCount( 1 );
 
-			Association asso = fetched.lazyAssociation.getFirst();
+			Association asso = fetched.lazyAssociation.get( 0 );
 			inspector.assertExecutedCount( 2 );
 
 			asso.mutableField = 5;