deps: bump prettier-plugin-packagejson from 2.5.20 to 2.5.21

Bumps [prettier-plugin-packagejson](https://github.com/matzkoh/prettier-plugin-packagejson) from 2.5.20 to 2.5.21.
- [Release notes](https://github.com/matzkoh/prettier-plugin-packagejson/releases)
- [Commits](matzkoh/prettier-plugin-packagejson@v2.5.20...v2.5.21)

---
updated-dependencies:
- dependency-name: prettier-plugin-packagejson
  dependency-version: 2.5.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]