Bump third_party/pigweed/repo from 71ba37c to ece923d

Bumps [third_party/pigweed/repo](https://github.com/google/pigweed) from `71ba37c` to `ece923d`.
- [Commits](google/pigweed@71ba37c...ece923d)

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

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