HADOOP-14649. Update aliyun-sdk-oss version to 2.8.1. (Genmao Yu via rchiang)

hadoop-project/pom.xml

@@ -1140,7 +1140,7 @@
       <dependency>
         <groupId>com.aliyun.oss</groupId>
         <artifactId>aliyun-sdk-oss</artifactId>
-        <version>2.4.1</version>
+        <version>2.8.1</version>
         <exclusions>
           <exclusion>
             <groupId>org.apache.httpcomponents</groupId>