submodule: bump third_party/openthread/repo from `e736d24` to `a04a68b` (#1180)
submodule: bump third_party/openthread/repo from `e736d24` to `a04a68b` (#1180)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `e736d24` to `a04a68b`.
- [Commits](https://github.com/openthread/openthread/compare/e736d2488d9d4f787650d81f2b84f59a194f2b41...a04a68b51b26d7c850b76a408d1e107f5d35934e)

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

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

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