chore(deps): update dependency reactiveui.avalonia to 12.1.0 (#464)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/Directory.Packages.props

@@ -21,7 +21,7 @@
     <PackageVersion Include="Avalonia" Version="12.1.0" />
     <PackageVersion Include="Avalonia.Themes.Fluent" Version="12.1.0" />
     <PackageVersion Include="Avalonia.Fonts.Inter" Version="12.1.0" />
-    <PackageVersion Include="ReactiveUI.Avalonia" Version="12.0.3" />
+    <PackageVersion Include="ReactiveUI.Avalonia" Version="12.1.0" />
     <PackageVersion Include="Avalonia.Diagnostics" Version="11.3.18" />
     <PackageVersion Include="Avalonia.Desktop" Version="12.1.0" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Debug" Version="10.0.10" />