chore(deps): Bump golang.org/x/tools from 0.8.0 to 0.9.1 in /hack (#438)

Bumps [golang.org/x/tools](https://github.com/golang/tools) from 0.8.0 to 0.9.1.
- [Release notes](https://github.com/golang/tools/releases)
- [Commits](golang/tools@v0.8.0...v0.9.1)

---
updated-dependencies:
- dependency-name: golang.org/x/tools
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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