submodule: bump openthread from `3e138d3` to `dadd60f` (#192)
submodule: bump openthread from `3e138d3` to `dadd60f` (#192)

Bumps [openthread](https://github.com/openthread/openthread) from `3e138d3` to `dadd60f`.
- [Commits](https://github.com/openthread/openthread/compare/3e138d3f5d549894b79cdc8567ed1f9215281344...dadd60f88a4f0f944748eb0b9d3c81be72e7fef4)

---
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-ifx,openthread/ot-ifx,openthread/ot-ifx