Bump Google.Protobuf from 3.13.0 to 3.15.0 in /section3/GrpcMicroservices/ShoppingCartWorkerService#6
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dependabot[bot] wants to merge 1 commit intomainfrom dependabot/nuget/section3/GrpcMicroservices/ShoppingCartWorkerService/Google.Protobuf-3.15.0
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