Fastjson has a serious security problem in 1.2.62,which will cause RCE

Fastjson has a serious security problem in 1.2.62,which will cause RCE

Fix https://github.com/apache/rocketmq/issues/2007

pom.xml

@@ -568,7 +568,7 @@
             <dependency>
                 <groupId>com.alibaba</groupId>
                 <artifactId>fastjson</artifactId>
-                <version>1.2.62</version>
+                <version>1.2.68</version>
             </dependency>
             <dependency>
                 <groupId>org.javassist</groupId>