Update UITT.

Author: sarahelsaig

Lombiq.HelpfulExtensions.Tests.UI/Lombiq.HelpfulExtensions.Tests.UI.csproj

@@ -36,7 +36,7 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(NuGetBuild)' == 'true'">
-    <PackageReference Include="Lombiq.Tests.UI" Version="11.1.1-alpha.2.osoe-903" />
+    <PackageReference Include="Lombiq.Tests.UI" Version="12.0.0" />
   </ItemGroup>
 
 </Project>