Bump linuxdoc from 20230321 to 20230506

Bumps [linuxdoc](https://github.com/return42/linuxdoc) from 20230321 to 20230506.
- [Changelog](https://github.com/return42/linuxdoc/blob/master/CHANGELOG)
- [Commits](https://github.com/return42/linuxdoc/commits

)

---
updated-dependencies:
- dependency-name: linuxdoc
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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