Bump third_party/ot-br-posix/repo from `03132d3` to `6529463` (#30932)

Bumps [third_party/ot-br-posix/repo](https://github.com/openthread/ot-br-posix) from `03132d3` to `6529463`.
- [Release notes](https://github.com/openthread/ot-br-posix/releases)
- [Commits](https://github.com/openthread/ot-br-posix/compare/03132d34368f6403b12d63df740dd8a69f73483d...65294638fbf1d9473c338746e21b137a9f8d1496)

---
updated-dependencies:
- dependency-name: third_party/ot-br-posix/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/ot-br-posix/repo b/third_party/ot-br-posix/repo
index 03132d3..6529463 160000
--- a/third_party/ot-br-posix/repo
+++ b/third_party/ot-br-posix/repo
@@ -1 +1 @@
-Subproject commit 03132d34368f6403b12d63df740dd8a69f73483d
+Subproject commit 65294638fbf1d9473c338746e21b137a9f8d1496