Bump third_party/pigweed/repo from e765c4d to ddbba2a

Bumps [third_party/pigweed/repo](https://github.com/google/pigweed) from `e765c4d` to `ddbba2a`.
- [Commits](google/pigweed@e765c4d...ddbba2a)

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

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