HHH-18675: Revert to java 11

Author: leonschenk

hibernate-core/src/main/java/org/hibernate/metamodel/internal/MetadataContext.java

@@ -280,8 +280,8 @@ public Map<String, IdentifiableDomainType<?>> getIdentifiableTypesByName() {
 			if ( !property.isGeneric() ) {
 				final PersistentAttribute<X, ?> concreteAttribute = factoryFunction.apply( entityType, property );
 				if ( concreteAttribute != null ) {
-					@SuppressWarnings("unchecked") final AttributeContainer<X> attributeContainer = (AttributeContainer<X>) entityType;
-					attributeContainer.getInFlightAccess().addConcreteGenericAttribute( concreteAttribute );
+					//noinspection unchecked
+					( (AttributeContainer<X>) entityType ).getInFlightAccess().addConcreteGenericAttribute( concreteAttribute );
 				}
 			}
 		}

hibernate-core/src/test/java/org/hibernate/orm/test/manytomany/generic/ManyToManyNonGenericTest.java

@@ -25,6 +25,7 @@
 import java.util.List;
 import java.util.Set;
 import java.util.UUID;
+import java.util.stream.Collectors;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.containsInAnyOrder;
@@ -102,7 +103,7 @@ public Set<Node> getChildren() {
 
 		@Override
 		public String toString() {
-			return "node [%s] parent of %s".formatted(id, children.stream().map(n -> n.id).toList());
+			return String.format("node [%s] parent of %s", id, children.stream().map(n -> n.id).collect(Collectors.toList()));
 		}
 	}
 }