Bump third_party/pigweed/repo from 4b50d0e to 06b03b3

Bumps [third_party/pigweed/repo](https://github.com/google/pigweed) from `4b50d0e` to `06b03b3`.
- [Release notes](https://github.com/google/pigweed/releases)
- [Commits](google/pigweed@4b50d0e...06b03b3)

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

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