chore(deps): update dependency system.reactive to 6.1.0

Author: renovate[bot]

src/directory.packages.props

@@ -21,7 +21,7 @@
     <PackageVersion Include="DynamicData" Version="9.4.1" />
     <PackageVersion Include="ReactiveMarbles.Mvvm" Version="1.0.95" />
     <PackageVersion Include="ReactiveMarbles.PropertyChanged" Version="2.0.27" />
-    <PackageVersion Include="System.Reactive" Version="6.0.2" />
+    <PackageVersion Include="System.Reactive" Version="6.1.0" />
   </ItemGroup>
 
   <ItemGroup>