chore(deps): update reactiveui to v21 (major) (#301)

chore(deps): update reactiveui to v21

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="4.14.0" />
-    <PackageVersion Include="ReactiveUI" Version="20.4.1" />
+    <PackageVersion Include="ReactiveUI" Version="21.0.1" />
     <PackageVersion Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
     <PackageVersion Include="Microsoft.Maui.Controls.Compatibility" Version="$(MauiVersion)" />
     <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0" />
@@ -28,7 +28,7 @@
     <PackageVersion Include="Avalonia.Diagnostics" Version="11.3.6" />
     <PackageVersion Include="Avalonia.Desktop" Version="11.3.6" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Debug" Version="9.0.0" />
-    <PackageVersion Include="ReactiveUI.Maui" Version="20.4.1" />
+    <PackageVersion Include="ReactiveUI.Maui" Version="21.0.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageVersion Include="System.Formats.Asn1" Version="9.0.0" />
     <PackageVersion Include="xunit" Version="2.9.3" />