Added missing Javadocs for Java 21

src/main/java/org/json/Cookie.java

@@ -15,6 +15,12 @@ Public Domain.
  */
 public class Cookie {
 
+    /**
+     * Constructs a new Cookie object.
+     */
+    public Cookie() {
+    }
+
     /**
      * Produce a copy of a string in which the characters '+', '%', '=', ';'
      * and control characters are replaced with "%hh". This is a gentle form