fix an incorrect type in SimpleProjectionSpecification

Author: gavinking

hibernate-core/src/main/java/org/hibernate/query/specification/SimpleProjectionSpecification.java

@@ -68,7 +68,7 @@ static <T,X> SimpleProjectionSpecification<T,X> create(
 	 */
 	static <T,X> SimpleProjectionSpecification<T,X> create(
 			SelectionSpecification<T> selectionSpecification,
-			SingularAttribute<T,X> projectedAttribute) {
+			SingularAttribute<? super T,X> projectedAttribute) {
 		return new SimpleProjectionSpecificationImpl<>( selectionSpecification, projectedAttribute );
 	}
 

hibernate-core/src/main/java/org/hibernate/query/specification/internal/SimpleProjectionSpecificationImpl.java

@@ -30,15 +30,15 @@ public class SimpleProjectionSpecificationImpl<T,X> implements SimpleProjectionS
 
 	private final SelectionSpecification<T> selectionSpecification;
 	private final Path<T, X> path;
-	private final SingularAttribute<T, X> attribute;
+	private final SingularAttribute<? super T, X> attribute;
 
 	public SimpleProjectionSpecificationImpl(SelectionSpecification<T> specification, Path<T, X> path) {
 		this.selectionSpecification = specification;
 		this.path = path;
 		this.attribute = null;
 	}
 
-	public SimpleProjectionSpecificationImpl(SelectionSpecification<T> specification, SingularAttribute<T, X> attribute) {
+	public SimpleProjectionSpecificationImpl(SelectionSpecification<T> specification, SingularAttribute<? super T, X> attribute) {
 		this.selectionSpecification = specification;
 		this.attribute = attribute;
 		this.path = null;