submodule: bump openthread from `a0718d9` to `d48799d` (#386)
submodule: bump openthread from `a0718d9` to `d48799d` (#386)

Bumps [openthread](https://github.com/openthread/openthread) from `a0718d9` to `d48799d`.
- [Commits](https://github.com/openthread/openthread/compare/a0718d90b1d3d4a63a83aea8b9f99985f4729126...d48799dddfde76b7b228f07144ba1d8f4e08e2e6)

---
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-nrf528xx,openthread/ot-nrf528xx