submodule: bump openthread from `9308db1` to `a603249` (#335)
submodule: bump openthread from `9308db1` to `a603249` (#335)

Bumps [openthread](https://github.com/openthread/openthread) from `9308db1` to `a603249`.
- [Commits](https://github.com/openthread/openthread/compare/9308db14c9e24067a81562236ce9ea6a5518f339...a6032491b85e49b2c0a42ffd9ba6be4205bddcb7)

---
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-cc13x2-cc26x2,openthread/ot-cc13x2-cc26x2