Update Avalonia package references to version 11.3.7.

src/PicView.Avalonia/PicView.Avalonia.csproj

@@ -145,10 +145,10 @@
   </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="Avalonia" Version="12.0.999-cibuild0059320-alpha"/>
-        <PackageReference Include="Avalonia.Desktop" Version="12.0.999-cibuild0059320-alpha"/>
+        <PackageReference Include="Avalonia" Version="11.3.7"/>
+        <PackageReference Include="Avalonia.Desktop" Version="11.3.7"/>
         <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
-        <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="12.0.999-cibuild0059320-alpha"/>
+        <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.3.7"/>
         <PackageReference Include="Magick.NET.AvaloniaMediaImaging" Version="1.1.5"/>
         <PackageReference Include="R3Extensions.Avalonia" Version="1.3.0" />
         <PackageReference Include="Svg.Controls.Skia.Avalonia" Version="11.3.6.2"/>

src/PicView.Tests/PicView.Tests.csproj

@@ -11,7 +11,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-      <PackageReference Include="Avalonia.Headless.XUnit" Version="12.0.999-cibuild0059320-alpha"/>
+      <PackageReference Include="Avalonia.Headless.XUnit" Version="12.0.999-cibuild0059348-alpha"/>
       <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0"/>
     <PackageReference Include="xunit" Version="2.9.3" />
       <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">