build(deps): bump deps/rapidjson from 3f73eda to 68afb49

Bumps [deps/rapidjson](https://github.com/Tencent/rapidjson) from `3f73eda` to `68afb49`.
- [Release notes](https://github.com/Tencent/rapidjson/releases)
- [Commits](Tencent/rapidjson@3f73eda...68afb49)

---
updated-dependencies:
- dependency-name: deps/rapidjson
  dependency-type: direct:production
...

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