chore(deps): bump fastjson from 1.2.67 to 1.2.68 (#800)

Bumps [fastjson](https://github.com/alibaba/fastjson) from 1.2.67 to 1.2.68.
- [Release notes](https://github.com/alibaba/fastjson/releases)
- [Commits](https://github.com/alibaba/fastjson/compare/1.2.67...1.2.68)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

build.gradle

@@ -70,7 +70,7 @@ ext {
     h2Version =  "1.4.196"
     levelDbVersion =  "0.12"
     jsonVersion =  "20190722"
-    fastJsonVersion =  "1.2.67"
+    fastJsonVersion =  "1.2.68"
     annotationsVersion = "3.0.1u2"
     zxingVersion = "3.4.0"
     huaweiObsVersion = "3.19.7"