Bump third_party/ot-br-posix/repo from `86cb36e` to `03132d3` (#30789)

Bumps [third_party/ot-br-posix/repo](https://github.com/openthread/ot-br-posix) from `86cb36e` to `03132d3`.
- [Release notes](https://github.com/openthread/ot-br-posix/releases)
- [Commits](https://github.com/openthread/ot-br-posix/compare/86cb36e8d5a20fb20a23ab9857faae125efca11d...03132d34368f6403b12d63df740dd8a69f73483d)

---
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 86cb36e..03132d3 160000
--- a/third_party/ot-br-posix/repo
+++ b/third_party/ot-br-posix/repo
@@ -1 +1 @@
-Subproject commit 86cb36e8d5a20fb20a23ab9857faae125efca11d
+Subproject commit 03132d34368f6403b12d63df740dd8a69f73483d