Remove unused test support class

core/spring-cloud-stream-test-support/src/main/java/org/springframework/cloud/stream/binder/SerializableFoo.java

@@ -1,32 +0,0 @@
-/*
- * Copyright 2017-2019 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.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.cloud.stream.binder;
-
-import java.io.Serializable;
-
-/**
- * @author Oleg Zhurakousky
- *
- */
-public class SerializableFoo implements Serializable {
-
-	/**
-	 *
-	 */
-	private static final long serialVersionUID = 1L;
-
-}