HADOOP-14654. Update httpclient version to 4.5.3. (rchiang)

hadoop-project/pom.xml

@@ -571,7 +571,7 @@
       <dependency>
         <groupId>org.apache.httpcomponents</groupId>
         <artifactId>httpclient</artifactId>
-        <version>4.5.2</version>
+        <version>4.5.3</version>
       </dependency>
       <dependency>
         <groupId>org.apache.httpcomponents</groupId>