Update src/main/java/com/alibaba/dashscope/rerank/TextReRank.java

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: luk384090-cloud

src/main/java/com/alibaba/dashscope/rerank/TextReRank.java

@@ -113,6 +113,7 @@ public TextReRankResult call(TextReRankParam param)
    */
   public void call(TextReRankParam param, ResultCallback<TextReRankResult> callback)
       throws ApiException, NoApiKeyException, InputRequiredException {
+    java.util.Objects.requireNonNull(callback, "callback must not be null");
     param.validate();
     ApiServiceOption callOption = copyServiceOption();
     callOption.setIsSSE(false);