Bump third_party/openthread/repo from d4155e4 to 0b269e1 (#29150)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `d4155e4` to `0b269e1`.
- [Release notes](https://github.com/openthread/openthread/releases)
- [Commits](openthread/openthread@d4155e4...0b269e1)

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

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

Author: dependabot[bot]