Bump phpgt/json from 2.2.0 to 2.2.1

Bumps [phpgt/json](https://github.com/phpgt/Json) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/phpgt/Json/releases)
- [Commits](phpgt/Json@v2.2.0...v2.2.1)

---
updated-dependencies:
- dependency-name: phpgt/json
  dependency-version: 2.2.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]