Bump third_party/openthread/repo from 0a6d0e7 to da08ac7

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `0a6d0e7` to `da08ac7`.
- [Release notes](https://github.com/openthread/openthread/releases)
- [Commits](openthread/openthread@0a6d0e7...da08ac7)

---
updated-dependencies:
- dependency-name: third_party/openthread/repo
  dependency-version: 1b805618025e406f85227187e3f2bc0b73fa17bd
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]