Remove duplicate com.google.truth dependency
Remove duplicate com.google.truth dependency

Fixes maven build warning
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: com.google.truth:truth:jar -> duplicate declaration of version ${truth.version}
GoogleCloudPlatform/DataflowTemplates,GoogleCloudPlatform/DataflowTemplates,GoogleCloudPlatform/DataflowTemplates,GoogleCloudPlatform/DataflowTemplates