Bump Google.Protobuf from 3.11.4 to 3.15.0 in /Lab8/GrpcGreeterClient/GrpcGreeterClient#2

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dependabot/nuget/Lab8/GrpcGreeterClient/GrpcGreeterClient/Google.Protobuf-3.15.0GiurgilaAlex/TSP.NET:dependabot/nuget/Lab8/GrpcGreeterClient/GrpcGreeterClient/Google.Protobuf-3.15.0Copy head branch name to clipboard