Bump third_party/ot-br-posix/repo from 13d583e to 9326cc3 (project-chip#31914)

Bumps [third_party/ot-br-posix/repo](https://github.com/openthread/ot-br-posix) from `13d583e` to `9326cc3`.
- [Release notes](https://github.com/openthread/ot-br-posix/releases)
- [Commits](openthread/ot-br-posix@13d583e...9326cc3)

---
updated-dependencies:
- dependency-name: third_party/ot-br-posix/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>

Author: dependabot[bot]