submodule: bump openthread from `f434479` to `c8902e9` (#11)
submodule: bump openthread from `f434479` to `c8902e9` (#11)

Bumps [openthread](https://github.com/openthread/openthread) from `f434479` to `c8902e9`.
- [Commits](https://github.com/openthread/openthread/compare/f4344792dafc2c11162e68062e32b4be433055ad...c8902e9419a17e618cec5827391ac2f3cc0b7b1e)

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

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