submodule: bump openthread from `bf33e2b` to `b468a25` (#465)
submodule: bump openthread from `bf33e2b` to `b468a25` (#465)

Bumps [openthread](https://github.com/openthread/openthread) from `bf33e2b` to `b468a25`.
- [Commits](https://github.com/openthread/openthread/compare/bf33e2b4bc7c4d353a37134c7f9b487d4b1fda48...b468a25a6102c0ffe5e0ab90c2d0adfca05bf402)

---
updated-dependencies:
- dependency-name: openthread
  dependency-type: direct:production
...

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-efr32,openthread/ot-efr32,openthread/ot-efr32