Bump third_party/nanopb/repo from 9766c45 to 9aa922d (#30436)

Bumps [third_party/nanopb/repo](https://github.com/nanopb/nanopb) from `9766c45` to `9aa922d`.
- [Commits](nanopb/nanopb@9766c45...9aa922d)

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

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