chore(deps): update dependency reactiveui to 20.3.1 (#254)

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

Author: renovate[bot]

src/Directory.Packages.props

@@ -11,7 +11,7 @@
     <PackageVersion Include="NuGet.Protocol" Version="6.14.0" />
     <PackageVersion Include="stylecop.analyzers" Version="1.2.0-beta.556" />
     <PackageVersion Include="Roslynator.Analyzers" Version="4.13.1" />
-    <PackageVersion Include="ReactiveUI" Version="20.2.45" />
+    <PackageVersion Include="ReactiveUI" Version="20.3.1" />
     <PackageVersion Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
     <PackageVersion Include="Microsoft.Maui.Controls.Compatibility" Version="$(MauiVersion)" />
     <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0" />