submodule: bump third_party/openthread/repo from d62167e to `694528…

…a` (#2016)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `d62167e` to `694528a`.
- [Commits](openthread/openthread@d62167e...694528a)

---
updated-dependencies:
- dependency-name: third_party/openthread/repo
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>