submodule: bump third_party/openthread/repo from `faeea3d` to `afcc48e` (#1628)
submodule: bump third_party/openthread/repo from `faeea3d` to `afcc48e` (#1628)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `faeea3d` to `afcc48e`.
- [Commits](https://github.com/openthread/openthread/compare/faeea3d2b9df48dd769592b7c5a85609c0c48389...afcc48eddec3a43cc856be6d4423bdbd906edc66)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/borderrouter,openthread/ot-br-posix,openthread/ot-br-posix,openthread/ot-br-posix,openthread/borderrouter,openthread/ot-br-posix,openthread/borderrouter,openthread/ot-br-posix,openthread/borderrouter,openthread/borderrouter,openthread/borderrouter,openthread/ot-br-posix