Update AssemblyVersion to 4.0.0.0 in Directory.Build.props

src/Directory.Build.props

@@ -4,7 +4,7 @@
         <AvaloniaVersion>11.3.8</AvaloniaVersion>
         <VersionPrefix>4.0.0</VersionPrefix>
         <VersionSuffix></VersionSuffix>
-        <AssemblyVersion>3.9.0.0</AssemblyVersion>
+        <AssemblyVersion>4.0.0.0</AssemblyVersion>
         <FileVersion>4.0.0</FileVersion>
     </PropertyGroup>
 </Project>