Bump third_party/ot-br-posix/repo from `bd15f71` to `b9210e7` #33

	# Copyright (c) 2024 Project CHIP Authors
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	name: Check for Unintentional Submodule Updates

	on:
	pull_request:
	branches-ignore:
	- 'dependabot/**'
	paths:
	- "third_party/**"
	- ".gitmodules"

	jobs:
	check-submodule-update-label:
	name: Check For Submodule Update Label
	runs-on: ubuntu-latest
	if: "!contains(github.event.pull_request.labels.*.name, 'changing-submodules-on-purpose')"
	steps:
	- name: Error Message
	run: echo This pull request attempts to update submodules without the changing-submodules-on-purpose label. Please apply that label if the changes are intentional, or remove those changes.
	- name: Fail Job
	run: exit 1

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