Bump third_party/pigweed/repo from 355d707 to cbbc73d (#31283)

Bumps [third_party/pigweed/repo](https://github.com/google/pigweed) from `355d707` to `cbbc73d`.
- [Commits](google/pigweed@355d707...cbbc73d)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>