Bump fastjson from 1.2.67 to 1.2.83 in /vpn-admin

Bumps [fastjson](https://github.com/alibaba/fastjson) from 1.2.67 to 1.2.83.
- [Release notes](https://github.com/alibaba/fastjson/releases)
- [Commits](alibaba/fastjson@1.2.67...1.2.83)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

vpn-admin/pom.xml

@@ -98,7 +98,7 @@
         <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>fastjson</artifactId>
-            <version>1.2.67</version>
+            <version>1.2.83</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/com.google.guava/guava -->
         <dependency>