submodule: bump openthread from `dd02bab` to `b66d521` (#355)
submodule: bump openthread from `dd02bab` to `b66d521` (#355)

Bumps [openthread](https://github.com/openthread/openthread) from `dd02bab` to `b66d521`.
- [Commits](https://github.com/openthread/openthread/compare/dd02babfebcdbee1dc66581a50f7c7a951b132b9...b66d521d1d08b9e8bec831a19ead00fec2a32ce9)

---
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-qorvo,openthread/ot-qorvo,openthread/ot-qorvo