GreatVoyage-v4.4.6 (David) updated the version of the dependency library fastjson to ensure the security of using fastjson.

# Other Changes

## 1. Update the fastjson dependency library to the latest version

Due to security vulnerabilities in fastjson 1.2.80 and earlier versions, GreatVoyage-v4.4.6 (David) updated the version of the fastjson dependency library to 1.2.83, and enabled the `safemode` mode of fastjson to ensure the safety of using fastjson.

Source Code：https://github.com/tronprotocol/java-tron/pull/4393

_Beauty in things exists in the mind which contemplates them. _

<p align="right"> ---David Hume</p>