submodule: bump openthread from `7b07dc5` to `2999f83` (#28)
submodule: bump openthread from `7b07dc5` to `2999f83` (#28)

Bumps [openthread](https://github.com/openthread/openthread) from `7b07dc5` to `2999f83`.
- [Commits](https://github.com/openthread/openthread/compare/7b07dc503bf7228238451b919d2a0728bcda77e9...2999f834e644cd84ad5991a104f736cf1da39ce0)

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

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-kw41z,openthread/ot-kw41z