submodule: bump openthread from `481a064` to `7e4d4d5` (#304)
submodule: bump openthread from `481a064` to `7e4d4d5` (#304)

Bumps [openthread](https://github.com/openthread/openthread) from `481a064` to `7e4d4d5`.
- [Commits](https://github.com/openthread/openthread/compare/481a064f034496d93273f4b837d46559f7b74e5c...7e4d4d5cc19d91ce83a593eca7ea563f6d3fe3e6)

---
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-qorvo,openthread/ot-qorvo,openthread/ot-qorvo