deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.81.2#6865

jinseopkim0 merged 2 commits into

googleapis:maingoogleapis/java-cloud-bom:mainfrom

renovate-bot:renovate/com.google.cloud-google-cloud-spanner-bom-6.xrenovate-bot/java-cloud-bom:renovate/com.google.cloud-google-cloud-spanner-bom-6.xCopy head branch name to clipboard