submodule: bump openthread from `3c01127` to `270dc21` (#174)
submodule: bump openthread from `3c01127` to `270dc21` (#174)

Bumps [openthread](https://github.com/openthread/openthread) from `3c01127` to `270dc21`.
- [Commits](https://github.com/openthread/openthread/compare/3c01127770b7d48a05ae0f506bee38dc911101f1...270dc21875455b8ab5da6ea088429439ac17acd1)

---
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-samr21,openthread/ot-samr21