Bump third_party/openthread/repo from 0f94f26 to e63c5d3 (#26125)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `0f94f26` to `e63c5d3`.
- [Release notes](https://github.com/openthread/openthread/releases)
- [Commits](openthread/openthread@0f94f26...e63c5d3)

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

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