Remove software.amazon.ion:ion-java from the licenses (#16413)

Remove software.amazon.ion:ion-java from the licenses as it is no longer a transient dependency of aws-java-sdk-core
Verified that after version 1.12.638 of aws-java-sdk-core doesnt have the ion-java as a dependency

licenses.yaml

@@ -2400,20 +2400,6 @@ libraries:
 
 ---
 
-name: Ion Java
-license_category: binary
-module: java-core
-license_name: Apache License version 2.0
-version: 1.0.2
-libraries:
-  - software.amazon.ion: ion-java
-notices:
-  - ion-java: |
-      Amazon Ion Java
-      Copyright 2007-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
-
----
-
 name: Apache Hadoop
 license_category: binary
 module: hadoop-client