Bump Java protobuf util version to the latest: 3.6.1 Bump google-cloud-core version to 1.61.0
Bump Java protobuf util version to the latest: 3.6.1
Bump google-cloud-core version to 1.61.0

PiperOrigin-RevId: 234170564

GoogleCloudPlatform/DataflowTemplates,GoogleCloudPlatform/DataflowTemplates,GoogleCloudPlatform/DataflowTemplates,GoogleCloudPlatform/DataflowTemplates