Remove JiBX support

Closes gh-27425

Author: jhoeller

spring-oxm/src/main/java/org/springframework/oxm/config/JibxMarshallerBeanDefinitionParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,10 +28,8 @@
 public class OxmNamespaceHandler extends NamespaceHandlerSupport {
 
 	@Override
-	@SuppressWarnings("deprecation")
 	public void init() {
 		registerBeanDefinitionParser("jaxb2-marshaller", new Jaxb2MarshallerBeanDefinitionParser());
-		registerBeanDefinitionParser("jibx-marshaller", new JibxMarshallerBeanDefinitionParser());
 	}
 
 }