Bump third_party/openthread/repo from ba826ff to 7f0b5fa

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `ba826ff` to `7f0b5fa`.
- [Release notes](https://github.com/openthread/openthread/releases)
- [Commits](openthread/openthread@ba826ff...7f0b5fa)

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

Signed-off-by: dependabot[bot] <[email protected]>