build(deps): Bump prettyplease in /tests/host_tools/uffd

Bumps [prettyplease](https://github.com/dtolnay/prettyplease) from 0.2.5 to 0.2.9.
- [Release notes](https://github.com/dtolnay/prettyplease/releases)
- [Commits](dtolnay/prettyplease@0.2.5...0.2.9)

---
updated-dependencies:
- dependency-name: prettyplease
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]