submodule: bump openthread from `d1653a8` to `53305d4` (#375)
submodule: bump openthread from `d1653a8` to `53305d4` (#375)

Bumps [openthread](https://github.com/openthread/openthread) from `d1653a8` to `53305d4`.
- [Commits](https://github.com/openthread/openthread/compare/d1653a8edc0240dc93c2c5fd5409188da4429a1f...53305d47620e8ba8019f8e9058714c3dc12930e3)

---
updated-dependencies:
- dependency-name: openthread
  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/ot-cc2538,openthread/ot-cc2538