Bump fastjson from 1.2.16 to 1.2.25 in /flink-connector-netty (#69)

Bumps [fastjson](https://github.com/alibaba/fastjson) from 1.2.16 to 1.2.25.
- [Release notes](https://github.com/alibaba/fastjson/releases)
- [Commits](https://github.com/alibaba/fastjson/compare/1.2.16...1.2.25)

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/flink-connector-netty/pom.xml b/flink-connector-netty/pom.xml
index 76c8934..5146985 100644
--- a/flink-connector-netty/pom.xml
+++ b/flink-connector-netty/pom.xml
@@ -57,7 +57,7 @@
     <dependency>
       <groupId>com.alibaba</groupId>
       <artifactId>fastjson</artifactId>
-      <version>1.2.16</version>
+      <version>1.2.25</version>
       <scope>test</scope>
     </dependency>
     <dependency>