chore(deps): update reactiveui to v6 (#489)

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

Author: renovate[bot]

src/Directory.Packages.props

@@ -14,8 +14,8 @@
     <PackageVersion Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="5.0.0-1.25277.114" />
     <PackageVersion Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="5.0.0-1.25277.114" />
     <PackageVersion Include="SonarAnalyzer.CSharp" Version="10.27.0.140913" />
-		<PackageVersion Include="ReactiveUI.Primitives" Version="5.8.0" />
-    <PackageVersion Include="ReactiveUI.Primitives.Reactive" Version="5.8.0" />
+		<PackageVersion Include="ReactiveUI.Primitives" Version="6.0.0" />
+    <PackageVersion Include="ReactiveUI.Primitives.Reactive" Version="6.0.0" />
   </ItemGroup>
 
   <!-- Benchmarks + tests -->