Bump Google.Protobuf from 3.9.1 to 3.15.0 in /KubernetesSample/src/StockWeb#3

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dependabot/nuget/KubernetesSample/src/StockWeb/Google.Protobuf-3.15.0RendleLabs/grpc-for-wcf-developers:dependabot/nuget/KubernetesSample/src/StockWeb/Google.Protobuf-3.15.0Copy head branch name to clipboard