submodule: bump openthread from `564982c` to `ff848e7` (#218)
submodule: bump openthread from `564982c` to `ff848e7` (#218)

Bumps [openthread](https://github.com/openthread/openthread) from `564982c` to `ff848e7`.
- [Commits](https://github.com/openthread/openthread/compare/564982c818666787096e5ad7a81a2d2f036aba36...ff848e7a2068f25c8415c5086149921f45ca4099)

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

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

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