submodule: bump openthread from `78e3b28` to `648770a` (#110)
submodule: bump openthread from `78e3b28` to `648770a` (#110)

Bumps [openthread](https://github.com/openthread/openthread) from `78e3b28` to `648770a`.
- [Commits](https://github.com/openthread/openthread/compare/78e3b2812744ededc126c1d12f5d67fdf3ee7f30...648770a8ade090876a675479ac00959f6843fd4d)

---
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>
Infineon/ot-ifx-release,openthread/ot-ifx,openthread/ot-ifx,openthread/ot-ifx,Infineon/ot-ifx-release,Infineon/ot-ifx-release