Bump ReactiveUI from 19.6.12 to 20.1.63

Bumps [ReactiveUI](https://github.com/reactiveui/reactiveui) from 19.6.12 to 20.1.63.
- [Release notes](https://github.com/reactiveui/reactiveui/releases)
- [Commits](reactiveui/ReactiveUI@19.6.12...20.1.63)

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

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

src/ImageSort/ImageSort.csproj

@@ -7,7 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="DynamicData" Version="9.0.4" />
-    <PackageReference Include="ReactiveUI" Version="19.6.12" />
+    <PackageReference Include="ReactiveUI" Version="20.1.63" />
     <PackageReference Include="GitVersionTask" Version="5.5.1">
       <PrivateAssets>All</PrivateAssets>
     </PackageReference>