Fix compile.

Author: lvyanquan

flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-paimon/src/test/java/org/apache/flink/cdc/connectors/paimon/sink/testsource/AppendOnlyTableSourceFunction.java

@@ -107,7 +107,9 @@ public void open(Configuration parameters) throws Exception {
     }
 
     @Override
-    public void run(SourceContext<Event> context) {
+    public void run(
+            org.apache.flink.streaming.api.functions.source.SourceFunction.SourceContext<Event>
+                    context) {
         // Emit all events in the first subtask
         if (getRuntimeContext().getTaskInfo().getIndexOfThisSubtask() == 0) {
             for (Event event : testEventList) {