Bump fastjson from 1.2.56 to 1.2.83 in /es-demo

Bumps [fastjson](https://github.com/alibaba/fastjson) from 1.2.56 to 1.2.83.
- [Release notes](https://github.com/alibaba/fastjson/releases)
- [Commits](https://github.com/alibaba/fastjson/compare/1.2.56...1.2.83)

---
updated-dependencies:
- dependency-name: com.alibaba:fastjson
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

es-demo/pom.xml

@@ -57,7 +57,7 @@
         <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>fastjson</artifactId>
-            <version>1.2.56</version>
+            <version>1.2.83</version>
         </dependency>
 
         <dependency>