submodule: bump openthread from `d5926a2` to `481a064` (#292)
submodule: bump openthread from `d5926a2` to `481a064` (#292)

Bumps [openthread](https://github.com/openthread/openthread) from `d5926a2` to `481a064`.
- [Commits](https://github.com/openthread/openthread/compare/d5926a2445ba30200ec7a41c2ccc163cc9bf5b71...481a064f034496d93273f4b837d46559f7b74e5c)

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