Bump third_party/openthread/repo from `b212a0a` to `33574ad` (#32203)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `b212a0a` to `33574ad`.
- [Release notes](https://github.com/openthread/openthread/releases)
- [Commits](https://github.com/openthread/openthread/compare/b212a0a748070ccbda765c3ebed2aab8b6b08fce...33574ad4175ffb088bcca047f4c8d5fb240d1495)

---
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>
diff --git a/third_party/openthread/repo b/third_party/openthread/repo
index b212a0a..33574ad 160000
--- a/third_party/openthread/repo
+++ b/third_party/openthread/repo
@@ -1 +1 @@
-Subproject commit b212a0a748070ccbda765c3ebed2aab8b6b08fce
+Subproject commit 33574ad4175ffb088bcca047f4c8d5fb240d1495