Update dependency ReactiveUI.WPF to 20.4.1

Author: dependencyupdates[bot]

src/Directory.Packages.props

@@ -65,7 +65,7 @@
     <PackageVersion Include="PropertyChanging.Fody" Version="1.30.3" />
     <PackageVersion Include="PublicApiGenerator" Version="11.4.6" />
     <PackageVersion Include="RavenDB.Embedded" Version="6.2.6" />
-    <PackageVersion Include="ReactiveUI.WPF" Version="20.1.63" />
+    <PackageVersion Include="ReactiveUI.WPF" Version="20.4.1" />
     <PackageVersion Include="Seq.Extensions.Logging" Version="8.0.0" />
     <PackageVersion Include="ServiceControl.Contracts" Version="5.0.0" />
     <PackageVersion Include="System.Configuration.ConfigurationManager" Version="8.0.1" />