Bump Microsoft.NETCore.UniversalWindowsPlatform from 6.2.11 to 6.2.12

Bumps [Microsoft.NETCore.UniversalWindowsPlatform](https://github.com/Microsoft/dotnet) from 6.2.11 to 6.2.12.
- [Release notes](https://github.com/Microsoft/dotnet/releases)
- [Commits](https://github.com/Microsoft/dotnet/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

test/test.harness.uwp/test.harness.uwp.csproj

@@ -107,7 +107,7 @@
     <Content Include="Assets\Wide310x150Logo.scale-200.png" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform" Version="6.2.11" />
+    <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform" Version="6.2.12" />
     <!-- I don't know where these are coming from, but older 4.0 versions are being included and causing downgrades -->
     <PackageReference Include="System.Runtime.InteropServices.RuntimeInformation" Version="4.3.0" />
     <PackageReference Include="System.ComponentModel.Primitives" Version="4.3.0" />