use AvaloniaVersion variable

Avalonia.Gif/Avalonia.Gif.csproj

@@ -10,7 +10,7 @@
 		<EnableWindowsTargeting>true</EnableWindowsTargeting>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Avalonia" Version="11.0.9" />
+    <PackageReference Include="Avalonia" Version="$(AvaloniaVersion)" />
     <PackageReference Include="SkiaSharp" Version="2.88.7" />
 	<PackageReference Include="DotNet.Bundle" Version="0.9.13" />
   </ItemGroup>

Directory.Build.props

@@ -0,0 +1,5 @@
+<Project>
+    <PropertyGroup>
+        <AvaloniaVersion>11.0.9</AvaloniaVersion>
+    </PropertyGroup>
+</Project>

StabilityMatrix.Avalonia.Diagnostics/StabilityMatrix.Avalonia.Diagnostics.csproj

@@ -19,8 +19,8 @@
     </ItemGroup>
 
     <ItemGroup>
-      <PackageReference Include="Avalonia" Version="11.0.9" />
-      <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.0.9" />
+      <PackageReference Include="Avalonia" Version="$(AvaloniaVersion)" />
+      <PackageReference Include="Avalonia.Controls.DataGrid" Version="$(AvaloniaVersion)" />
       <PackageReference Include="DotNet.Bundle" Version="0.9.13" />
       <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
       <PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.0" />

StabilityMatrix.Avalonia/StabilityMatrix.Avalonia.csproj

@@ -39,14 +39,14 @@
         <PackageReference Include="AsyncImageLoader.Avalonia" Version="3.2.1" />
         <PackageReference Include="AutoComplete.Net" Version="1.2211.2014.42"/>
         <PackageReference Include="Avalonia.AvaloniaEdit" Version="11.0.6" />
-        <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.0.9" />
-        <PackageReference Include="Avalonia.Controls.ItemsRepeater" Version="11.0.9" />
+        <PackageReference Include="Avalonia.Controls.DataGrid" Version="$(AvaloniaVersion)" />
+        <PackageReference Include="Avalonia.Controls.ItemsRepeater" Version="$(AvaloniaVersion)" />
         <PackageReference Include="Avalonia.Controls.PanAndZoom" Version="11.0.0.2" />
-        <PackageReference Include="Avalonia" Version="11.0.9" />
-        <PackageReference Include="Avalonia.Desktop" Version="11.0.9" />
-        <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.9" />
+        <PackageReference Include="Avalonia" Version="$(AvaloniaVersion)" />
+        <PackageReference Include="Avalonia.Desktop" Version="$(AvaloniaVersion)" />
+        <PackageReference Include="Avalonia.Fonts.Inter" Version="$(AvaloniaVersion)" />
         <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
-        <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.9" />
+        <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="$(AvaloniaVersion)" />
         <PackageReference Include="Avalonia.HtmlRenderer" Version="11.0.0" />
         <PackageReference Include="Avalonia.Labs.Controls" Version="11.0.3" />
         <PackageReference Include="Avalonia.Xaml.Behaviors" Version="11.0.6" />

StabilityMatrix.UITests/StabilityMatrix.UITests.csproj

@@ -15,7 +15,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Avalonia.Headless.XUnit" Version="11.0.9" />
+        <PackageReference Include="Avalonia.Headless.XUnit" Version="$(AvaloniaVersion)" />
         <PackageReference Include="DotNet.Bundle" Version="0.9.13" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
         <PackageReference Include="NSubstitute" Version="5.1.0" />