[ISSUE-3085][Improve] Improve streampark-flink module based on [3.4 Collection Rule]

returns List if use ArrayList

Co-authored-by: xujiawei <xujiawei@do1.com.cn>
diff --git a/streampark-flink/streampark-flink-connector/streampark-flink-connector-doris/src/main/java/org/apache/streampark/flink/connector/doris/bean/DorisSinkBufferEntry.java b/streampark-flink/streampark-flink-connector/streampark-flink-connector-doris/src/main/java/org/apache/streampark/flink/connector/doris/bean/DorisSinkBufferEntry.java
index f8cee82..97ce5c8 100644
--- a/streampark-flink/streampark-flink-connector/streampark-flink-connector-doris/src/main/java/org/apache/streampark/flink/connector/doris/bean/DorisSinkBufferEntry.java
+++ b/streampark-flink/streampark-flink-connector/streampark-flink-connector-doris/src/main/java/org/apache/streampark/flink/connector/doris/bean/DorisSinkBufferEntry.java
@@ -26,11 +26,11 @@
 
   private static final long serialVersionUID = 1L;
 
-  public ArrayList<byte[]> getBuffer() {
+  public List<byte[]> getBuffer() {
     return buffer;
   }
 
-  private ArrayList<byte[]> buffer = new ArrayList<>();
+  private List<byte[]> buffer = new ArrayList<>();
   private int batchCount = 0;
   private long batchSize = 0;
   private String label;