chore(deps): bump third_party/cmp from 643e6a6 to 9b8fa1e

Bumps [third_party/cmp](https://github.com/camgunz/cmp) from `643e6a6` to `9b8fa1e`.
- [Release notes](https://github.com/camgunz/cmp/releases)
- [Commits](camgunz/cmp@643e6a6...9b8fa1e)

---
updated-dependencies:
- dependency-name: third_party/cmp
  dependency-type: direct:production
...

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