Merge pull request #119 from nunit/dependabot/nuget/tests/nunit.runner.tests.uwp/Microsoft.NETCore.UniversalWindowsPlatform-6.0.6

Bump Microsoft.NETCore.UniversalWindowsPlatform from 6.0.1 to 6.0.6 in /tests/nunit.runner.tests.uwp

tests/nunit.runner.tests.uwp/nunit.runner.tests.uwp.csproj

@@ -125,7 +125,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Xamarin.Forms" Version="2.5.0.280555" />
-    <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform" Version="6.0.1" />
+    <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform" Version="6.0.6" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\src\nunit.xamarin\nunit.xamarin.csproj">