Bump joi from 17.7.1 to 17.8.1 (#952)

Bumps [joi](https://github.com/hapijs/joi) from 17.7.1 to 17.8.1.
- [Release notes](https://github.com/hapijs/joi/releases)
- [Commits](hapijs/joi@v17.7.1...v17.8.1)

---
updated-dependencies:
- dependency-name: joi
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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