submodule: bump openthread from `efedbe9` to `f538240` (#244)
submodule: bump openthread from `efedbe9` to `f538240` (#244)

Bumps [openthread](https://github.com/openthread/openthread) from `efedbe9` to `f538240`.
- [Commits](https://github.com/openthread/openthread/compare/efedbe9784663fca9cb4a1010b00c2154622254c...f538240cd2d6db1280dd55bdb811417ef0b5f990)

---
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-nxp,openthread/ot-nxp,openthread/ot-nxp