submodule: bump openthread from `cf21d57` to `ea5a5fb` (#43)
submodule: bump openthread from `cf21d57` to `ea5a5fb` (#43)

Bumps [openthread](https://github.com/openthread/openthread) from `cf21d57` to `ea5a5fb`.
- [Commits](https://github.com/openthread/openthread/compare/cf21d5760a993ffedee7f6cd5983e03738b48de6...ea5a5fbd53615f0a537f4565d1f997a87813beaa)

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

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-samr21,openthread/ot-samr21