Bump NuGet.Protocol, NuGet.Packaging and NuGet.Common (#1795)

Bumps [NuGet.Protocol](https://github.com/NuGet/NuGet.Client),
[NuGet.Packaging](https://github.com/NuGet/NuGet.Client) and
[NuGet.Common](https://github.com/NuGet/NuGet.Client). These
dependencies needed to be updated together.
Updates `NuGet.Protocol` from 6.10.0 to 6.11.0
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Updates `NuGet.Packaging` from 6.10.0 to 6.11.0
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Updates `NuGet.Common` from 6.10.0 to 6.11.0
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Directory.Packages.props

@@ -14,9 +14,9 @@
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageVersion Include="NSubstitute" Version="5.1.0" />
-    <PackageVersion Include="NuGet.Common" Version="6.10.0" />
-    <PackageVersion Include="NuGet.Packaging" Version="6.10.0" />
-    <PackageVersion Include="NuGet.Protocol" Version="6.10.0" />
+    <PackageVersion Include="NuGet.Common" Version="6.11.0" />
+    <PackageVersion Include="NuGet.Packaging" Version="6.11.0" />
+    <PackageVersion Include="NuGet.Protocol" Version="6.11.0" />
     <PackageVersion Include="NuGet.Resolver" Version="6.10.0" />
     <PackageVersion Include="ObjectLayoutInspector" Version="0.1.4" />
     <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.556" />