Bump Newtonsoft.Json, NuGet.Common and NuGet.Packaging (dotnet#1894)

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json),
[NuGet.Common](https://github.com/NuGet/NuGet.Client) and
[NuGet.Packaging](https://github.com/NuGet/NuGet.Client). These
dependencies needed to be updated together.
Updates `Newtonsoft.Json` from 13.0.3 to 13.0.3
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Updates `NuGet.Common` from 6.12.1 to 6.13.2
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Updates `NuGet.Packaging` from 6.12.1 to 6.13.2
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Directory.Packages.props

@@ -15,16 +15,16 @@
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageVersion Include="NSubstitute" Version="5.3.0" />
-    <PackageVersion Include="NuGet.Common" Version="6.12.1" />
-    <PackageVersion Include="NuGet.Packaging" Version="6.12.1" />
+    <PackageVersion Include="NuGet.Common" Version="6.13.2" />
+    <PackageVersion Include="NuGet.Packaging" Version="6.13.2" />
     <PackageVersion Include="NuGet.Protocol" Version="6.12.1" />
     <PackageVersion Include="NuGet.Resolver" Version="6.12.1" />
     <PackageVersion Include="ObjectLayoutInspector" Version="0.1.4" />
     <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.556" />
     <PackageVersion Include="Svg" Version="3.4.7" />
     <PackageVersion Include="System.CodeDom" Version="8.0.0" />
     <PackageVersion Include="System.IO.Packaging" Version="8.0.1" />
-    <PackageVersion Include="System.Collections.Immutable" Version="7.0.0" />
+    <PackageVersion Include="System.Collections.Immutable" Version="8.0.0" />
     <PackageVersion Include="System.Net.Http" Version="4.3.4" />
     <PackageVersion Include="System.Security.Cryptography.Algorithms" Version="4.3.1" />
     <PackageVersion Include="System.Text.Json" Version="9.0.0" />