Fixes the test suite

src/PostIt/Directory.Packages.props

@@ -3,7 +3,10 @@
   <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Packages.props', '$(MSBuildThisFileDirectory)../'))" />
   <!-- PostIt-product-specific versions -->
   <ItemGroup>
+    <PackageVersion Include="Xamarin.UITest" Version="4.4.2" />
     <PackageVersion Include="Avalonia" Version="12.1.1" />
+    <PackageVersion Include="Avalonia.Headless" Version="12.1.1" />
+    <PackageVersion Include="Avalonia.Headless.Xunit" Version="12.1.1" />
     <PackageVersion Include="Avalonia.Android" Version="12.1.1" />
     <PackageVersion Include="Avalonia.AvaloniaEdit" Version="12.0.0" />
     <PackageVersion Include="Avalonia.Browser" Version="12.1.1" />

src/PostIt/PostIt.Tests/Directory.Packages.props

@@ -1,10 +0,0 @@
-<Project>
-  <!-- Pull in shared package versions from the repository root. -->
-  <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Packages.props', '$(MSBuildThisFileDirectory)../'))" />
-  <!-- PostIt.Tests-specific versions -->
-  <ItemGroup>
-    <PackageVersion Include="Avalonia.Headless" Version="12.0.4" />
-    <PackageVersion Include="Avalonia.Headless.XUnit" Version="12.0.4" />
-    <PackageVersion Include="Xamarin.UITest" Version="4.4.2" />
-  </ItemGroup>
-</Project>

src/PostIt/PostIt.Tests/PostIt.Tests.csproj

@@ -27,6 +27,7 @@
     <Using Include="Xunit" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="GitVersion.MsBuild" />
+    <PackageReference Include="Avalonia.Headless.XUnit" />
+    <PackageReference Include="Xamarin.UITest" />
   </ItemGroup>
 </Project>