java 8 fix

Author: tejanshrana

flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/source/reader/MySqlRecordEmitterTest.java

@@ -89,7 +89,7 @@ record -> {
 
     private MySqlRecordEmitter<Void> createRecordEmitter() {
         return new MySqlRecordEmitter<>(
-                new DebeziumDeserializationSchema<>() {
+                new DebeziumDeserializationSchema<Void>() {
                     @Override
                     public void deserialize(SourceRecord record, Collector<Void> out) {
                         throw new UnsupportedOperationException();