Update dependency ReactiveUI.WPF to 20.4.1

Author: dependencyupdates[bot]

src/Directory.Packages.props

@@ -66,7 +66,7 @@
     <PackageVersion Include="PropertyChanging.Fody" Version="1.31.0" />
     <PackageVersion Include="PublicApiGenerator" Version="11.5.4" />
     <PackageVersion Include="RavenDB.Embedded" Version="6.2.13" />
-    <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="5.1.0" />
     <PackageVersion Include="System.Configuration.ConfigurationManager" Version="10.0.2" />