Bump Google.Protobuf from 3.12.0 to 3.15.0 in /PersonalData.GrpcService#2

dependabot[bot] wants to merge 1 commit intomastervirangp21/DotNetCore-gRPC-ClientServer:masterfrom

dependabot/nuget/PersonalData.GrpcService/Google.Protobuf-3.15.0virangp21/DotNetCore-gRPC-ClientServer:dependabot/nuget/PersonalData.GrpcService/Google.Protobuf-3.15.0Copy head branch name to clipboard