submodule: bump openthread from 0b0db37 to 7074a43

Bumps [openthread](https://github.com/openthread/openthread) from `0b0db37` to `7074a43`.
- [Release notes](https://github.com/openthread/openthread/releases)
- [Commits](openthread/openthread@0b0db37...7074a43)

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

Signed-off-by: dependabot[bot] <[email protected]>