Bump ReactiveUI from 19.6.1 to 20.0.1

Bumps [ReactiveUI](https://github.com/reactiveui/reactiveui) from 19.6.1 to 20.0.1.
- [Release notes](https://github.com/reactiveui/reactiveui/releases)
- [Commits](https://github.com/reactiveui/reactiveui/compare/19.6.1...20.0.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

ReactiveExample/ReactiveExample.csproj

@@ -11,7 +11,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="ReactiveUI.Fody" Version="19.5.41" />
-    <PackageReference Include="ReactiveUI" Version="19.6.1" />
+    <PackageReference Include="ReactiveUI" Version="20.0.1" />
     <PackageReference Include="ReactiveMarbles.ObservableEvents.SourceGenerator" Version="1.3.1" PrivateAssets="all" />
   </ItemGroup>
   <ItemGroup>