Bump Google.Protobuf from 3.11.2 to 3.15.0 in /DuplexCalculator/CalculatorCore/src/CalculatorCore.Client#1

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dependabot/nuget/DuplexCalculator/CalculatorCore/src/CalculatorCore.Client/Google.Protobuf-3.15.0VisualReCode/Examples:dependabot/nuget/DuplexCalculator/CalculatorCore/src/CalculatorCore.Client/Google.Protobuf-3.15.0Copy head branch name to clipboard