[ROCKETMQ-143][HOTFIX] Update fastjson from 1.2.12 to 1.2.28

Author: zhouxinyu

pom.xml

@@ -606,7 +606,7 @@
             <dependency>
                 <groupId>com.alibaba</groupId>
                 <artifactId>fastjson</artifactId>
-                <version>1.2.12</version>
+                <version>1.2.28</version>
             </dependency>
             <dependency>
                 <groupId>org.javassist</groupId>