HHH-18403 Disable returning clause support for updates on DB2 for i

hibernate-core/src/main/java/org/hibernate/dialect/DB2iDialect.java

@@ -92,6 +92,12 @@ public class DB2iDialect extends DB2Dialect {
 		return true;
 	}
 
+	@Override
+	public boolean supportsUpdateReturning() {
+		// Only supported for insert statements on DB2 for i: https://www.ibm.com/docs/en/i/7.1?topic=clause-table-reference
+		return false;
+	}
+
 	/**
 	 * No support for sequences.
 	 */