Update fastjson to 1.2.68

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

pom.xml

@@ -41,7 +41,7 @@
 
     <properties>
         <!-- Compile libs -->
-        <fastjson.version>1.2.62</fastjson.version>
+        <fastjson.version>1.2.68</fastjson.version>
         <javax.annotation-api.version>1.3.2</javax.annotation-api.version>
 
         <!-- Test libs -->