submodule: bump third_party/openthread/repo from `3d146f3` to `5516024` (#1517)
submodule: bump third_party/openthread/repo from `3d146f3` to `5516024` (#1517)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `3d146f3` to `5516024`.
- [Commits](https://github.com/openthread/openthread/compare/3d146f3f603f4db83e5e8ebf15a92689c00150a5...551602490555033a010ed4b4649821df4b2b882d)

---
updated-dependencies:
- dependency-name: third_party/openthread/repo
  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/borderrouter,openthread/ot-br-posix,openthread/ot-br-posix,openthread/ot-br-posix,openthread/borderrouter,openthread/ot-br-posix,openthread/borderrouter,openthread/borderrouter,openthread/ot-br-posix,openthread/borderrouter,openthread/ot-br-posix,openthread/borderrouter