feat: update ProductVersion to 2.0.3

The ProductVersion in the Directory.Build.props file has been updated from 2.0.2 to 2.0.3. This ensures that our project is using the expected version of the product.

src/Directory.Build.props

@@ -1,7 +1,7 @@
 <Project>
   <PropertyGroup>
     <Nullable>enable</Nullable>
-    <ProductVersion>2.0.2</ProductVersion>
+    <ProductVersion>2.0.3</ProductVersion>
     <AvaloniaVersion>11.0.6</AvaloniaVersion>
     <AsvCommonVersion>1.13.1</AsvCommonVersion>
     <FluentAvaloniaUIVersion>2.0.0</FluentAvaloniaUIVersion>