Remove Serializable from UniqueIdFormat

Author: mpkorstanje

junit-platform-engine/src/main/java/org/junit/platform/engine/UniqueIdFormat.java

@@ -33,10 +33,7 @@
  *
  * @since 1.0
  */
-class UniqueIdFormat implements Serializable {
-
-	@Serial
-	private static final long serialVersionUID = 1L;
+class UniqueIdFormat {
 
 	private static final UniqueIdFormat defaultFormat = new UniqueIdFormat('[', ':', ']', '/');