Bump ReactiveUI.WPF and ReactiveUI (#575)

Bumps [ReactiveUI.WPF](https://github.com/reactiveui/reactiveui) and [ReactiveUI](https://github.com/reactiveui/reactiveui). These dependencies needed to be updated together.

Updates `ReactiveUI.WPF` from 19.6.1 to 20.0.1
- [Release notes](https://github.com/reactiveui/reactiveui/releases)
- [Commits](reactiveui/ReactiveUI@19.6.1...20.0.1)

Updates `ReactiveUI` from 19.6.12 to 20.0.1
- [Release notes](https://github.com/reactiveui/reactiveui/releases)
- [Commits](reactiveui/ReactiveUI@19.6.12...20.0.1)

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

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

src/ImageSort.WPF/ImageSort.WPF.csproj

@@ -19,9 +19,9 @@
     <PackageReference Include="AdonisUI.ClassicTheme" Version="1.17.1" />
     <PackageReference Include="LazyCache" Version="2.4.0" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
-    <PackageReference Include="ReactiveUI" Version="19.6.12" />
+    <PackageReference Include="ReactiveUI" Version="20.0.1" />
     <PackageReference Include="ReactiveUI.Events.WPF" Version="15.1.1" />
-    <PackageReference Include="ReactiveUI.WPF" Version="19.6.1" />
+    <PackageReference Include="ReactiveUI.WPF" Version="20.0.1" />
     <PackageReference Include="GitVersionTask" Version="5.5.1">
       <PrivateAssets>All</PrivateAssets>
     </PackageReference>