submodule: bump openthread from `5e23211` to `de53d72` (#91)
submodule: bump openthread from `5e23211` to `de53d72` (#91)

Bumps [openthread](https://github.com/openthread/openthread) from `5e23211` to `de53d72`.
- [Commits](https://github.com/openthread/openthread/compare/5e23211e048cf8fcc4038bcb4d3a876fb4044e21...de53d721de0fff63c092322ee64637853197b031)

---
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-cc2538,openthread/ot-cc2538