Update dependency ReactiveUI.Maui to 20.4.1

Author: renovate[bot]

src/Directory.Packages.props

@@ -4,7 +4,7 @@
     <CentralPackageTransitivePinningEnabled>true</CentralPackageTransitivePinningEnabled>
   </PropertyGroup>
   <ItemGroup>
-    <PackageVersion Include="ReactiveUI.Maui" Version="20.1.63" />
+    <PackageVersion Include="ReactiveUI.Maui" Version="20.4.1" />
     <PackageVersion Include="Mopups" Version="1.3.1" />
   </ItemGroup>
   <ItemGroup>