submodule: bump openthread from `01dd492` to `20aee3f` (#330)
submodule: bump openthread from `01dd492` to `20aee3f` (#330)

Bumps [openthread](https://github.com/openthread/openthread) from `01dd492` to `20aee3f`.
- [Commits](https://github.com/openthread/openthread/compare/01dd49286e3056a09fd62fdeac0db53cb4a9e4a0...20aee3fa706d7936594f6decaf3747fc9166a166)

---
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-samr21,openthread/ot-samr21