submodule: bump openthread from `83cecbb` to `39e6172` (#14)
submodule: bump openthread from `83cecbb` to `39e6172` (#14)

Bumps [openthread](https://github.com/openthread/openthread) from `83cecbb` to `39e6172`.
- [Commits](https://github.com/openthread/openthread/compare/83cecbb8e3f9418e3953e3ce65c269561b3f947b...39e6172304c4e5bdadf2fa6dbdc4d7a7f6987ebc)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-cc13x2-cc26x2,openthread/ot-cc13x2-cc26x2