Bump MessagePack from 1.7.3.4 to 1.9.11 in /src/WebApiContrib.Core.Formatter.MessagePack#203

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dependabot/nuget/src/WebApiContrib.Core.Formatter.MessagePack/MessagePack-1.9.11WebApiContrib/WebAPIContrib.Core:dependabot/nuget/src/WebApiContrib.Core.Formatter.MessagePack/MessagePack-1.9.11Copy head branch name to clipboard