Bump third_party/pigweed/repo from 5c4ea8e to e72f0d5 (#26413)

Bumps [third_party/pigweed/repo](https://github.com/google/pigweed) from `5c4ea8e` to `e72f0d5`.
- [Commits](google/pigweed@5c4ea8e...e72f0d5)

---
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>