Update dependency System.Reactive to 6.1.0 (#1507)

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

Author: renovate[bot]

Directory.Packages.props

@@ -44,7 +44,7 @@
     <PackageVersion Include="Spectre.Console.Testing" Version="0.53.0" />
     <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.556" />
     <PackageVersion Include="System.Memory" Version="4.6.3" />
-    <PackageVersion Include="System.Reactive" Version="6.0.1" />
+    <PackageVersion Include="System.Reactive" Version="6.1.0" />
     <PackageVersion Include="System.Runtime.Loader" Version="4.3.0" />
     <PackageVersion Include="System.Text.Json" Version="8.0.5" />
     <PackageVersion Include="System.Threading.Tasks.Dataflow" Version="8.0.1" />