Pin Newtonsoft.Json to version 13.0.1 (#391)

Author: jeffkl

Packages.props

@@ -9,6 +9,7 @@
     <PackageReference Update="Microsoft.NET.Test.Sdk" Version="17.3.2" />
     <PackageReference Update="Microsoft.Win32.Registry" Version="4.7.0" />
     <PackageReference Update="MSBuild.ProjectCreation" Version="8.3.0" />
+    <PackageReference Update="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Update="Shouldly" Version="4.1.0" />
     <PackageReference Update="xunit" Version="2.4.2" />
     <PackageReference Update="xunit.runner.visualstudio" Version="2.4.5" />

src/Artifacts.UnitTests/Microsoft.Build.Artifacts.UnitTests.csproj

@@ -6,6 +6,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
     <PackageReference Include="MSBuild.ProjectCreation" />
+    <PackageReference Include="Newtonsoft.Json" />
     <PackageReference Include="Shouldly" />
     <PackageReference Include="xunit" />
     <PackageReference Include="xunit.runner.visualstudio" />

src/CentralPackageVersions.UnitTests/Microsoft.Build.CentralPackageVersions.UnitTests.csproj

@@ -6,6 +6,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
     <PackageReference Include="MSBuild.ProjectCreation" />
+    <PackageReference Include="Newtonsoft.Json" />
     <PackageReference Include="Shouldly" />
     <PackageReference Include="xunit" />
     <PackageReference Include="xunit.runner.visualstudio" />

src/NoTargets.UnitTests/Microsoft.Build.NoTargets.UnitTests.csproj

@@ -6,6 +6,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
     <PackageReference Include="MSBuild.ProjectCreation" />
+    <PackageReference Include="Newtonsoft.Json" />
     <PackageReference Include="Shouldly" />
     <PackageReference Include="xunit" />
     <PackageReference Include="xunit.runner.visualstudio" />

src/Traversal.UnitTests/Microsoft.Build.Traversal.UnitTests.csproj

@@ -6,6 +6,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
     <PackageReference Include="MSBuild.ProjectCreation" />
+    <PackageReference Include="Newtonsoft.Json" />
     <PackageReference Include="Shouldly" />
     <PackageReference Include="xunit" />
     <PackageReference Include="xunit.runner.visualstudio" />