submodule: bump openthread from `733750b` to `f561b44` (#299)
submodule: bump openthread from `733750b` to `f561b44` (#299)

Bumps [openthread](https://github.com/openthread/openthread) from `733750b` to `f561b44`.
- [Commits](https://github.com/openthread/openthread/compare/733750b3de73311feb5e37d6deaa0b71a5396f15...f561b44586d3ca5249ff22b0a5c2ee0121bdb467)

---
updated-dependencies:
- dependency-name: openthread
  dependency-type: direct:production
...

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

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-samr21,openthread/ot-samr21