Bump python-rapidjson from 1.21 to 1.22 in /flowmachine

Bumps [python-rapidjson](https://github.com/python-rapidjson/python-rapidjson) from 1.21 to 1.22.
- [Changelog](https://github.com/python-rapidjson/python-rapidjson/blob/master/CHANGES.rst)
- [Commits](python-rapidjson/python-rapidjson@v1.21...v1.22)

---
updated-dependencies:
- dependency-name: python-rapidjson
  dependency-version: '1.22'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]