chore(deps): update reactiveui to 12.0.3

Author: renovate[bot]

src/Directory.Packages.props

@@ -21,7 +21,7 @@
     <PackageVersion Include="Avalonia" Version="12.0.4" />
     <PackageVersion Include="Avalonia.Themes.Fluent" Version="12.0.4" />
     <PackageVersion Include="Avalonia.Fonts.Inter" Version="12.0.4" />
-    <PackageVersion Include="ReactiveUI.Avalonia" Version="12.0.2" />
+    <PackageVersion Include="ReactiveUI.Avalonia" Version="12.0.3" />
     <PackageVersion Include="Avalonia.Diagnostics" Version="11.3.17" />
     <PackageVersion Include="Avalonia.Desktop" Version="12.0.4" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Debug" Version="10.0.8" />