deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.68.1 #2045

	# Copyright 2023 Google LLC
	#
	# 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.
	# Github action job to test core java library features on
	# downstream client libraries before they are released.
	on:
	push:
	branches:
	- main
	pull_request:
	name: test for tests/validate-bom logic
	jobs:
	test-invalid-bom:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Fetch the bad protobuf-bom version 3.22.1
	shell: bash
	# 3.22.1 had a issue in their pom.xml
	# https://github.com/protocolbuffers/protobuf/issues/12170
	run: \|
	mkdir -p bad-protobuf-bom
	curl https://repo1.maven.org/maven2/com/google/protobuf/protobuf-bom/3.22.1/protobuf-bom-3.22.1.pom \
	--output bad-protobuf-bom/pom.xml
	- name: Check the bad BOM
	uses: ./tests/validate-bom
	id: validate-bom
	with:
	bom-path: bad-protobuf-bom/pom.xml
	continue-on-error: true
	- name: Ensure the validate-bom invalidated the bad BOM
	shell: bash
	if: steps.validate-bom.outcome != 'failure'
	run: \|
	echo "The validate-bom check should have invalidated the bad BOM"
	exit 1

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