Bump ReactiveUI.WPF from 19.5.1 to 19.6.1 (#4042)

Bumps [ReactiveUI.WPF](https://github.com/reactiveui/reactiveui) from 19.5.1 to 19.6.1.
- [Release notes](https://github.com/reactiveui/reactiveui/releases)
- [Commits](reactiveui/ReactiveUI@19.5.1...19.6.1)

---
updated-dependencies:
- dependency-name: ReactiveUI.WPF
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/Directory.Packages.props

@@ -54,7 +54,7 @@
     <PackageVersion Include="PropertyChanging.Fody" Version="1.30.3" />
     <PackageVersion Include="PublicApiGenerator" Version="11.1.0" />
     <PackageVersion Include="RavenDB.Embedded" Version="5.4.115" />
-    <PackageVersion Include="ReactiveUI.WPF" Version="19.5.1" />
+    <PackageVersion Include="ReactiveUI.WPF" Version="19.6.1" />
     <PackageVersion Include="ServiceControl.Contracts" Version="4.0.0" />
     <PackageVersion Include="System.Configuration.ConfigurationManager" Version="8.0.0" />
     <PackageVersion Include="System.Diagnostics.PerformanceCounter" Version="8.0.0" />