Bump ReactiveUI from 17.1.17 to 18.0.7

Bumps [ReactiveUI](https://github.com/reactiveui/reactiveui) from 17.1.17 to 18.0.7.
- [Release notes](https://github.com/reactiveui/reactiveui/releases)
- [Commits](https://github.com/reactiveui/reactiveui/compare/17.1.17...18.0.7)

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

Signed-off-by: dependabot[bot] <support@github.com>

ReactiveExample/ReactiveExample.csproj

@@ -5,7 +5,7 @@
     </PropertyGroup>
     <ItemGroup>
         <PackageReference Include="ReactiveUI.Fody" Version="17.1.17" />
-        <PackageReference Include="ReactiveUI" Version="17.1.17" />
+        <PackageReference Include="ReactiveUI" Version="18.0.7" />
         <PackageReference Include="ReactiveMarbles.ObservableEvents.SourceGenerator" Version="1.1.4" PrivateAssets="all" />
     </ItemGroup>
     <ItemGroup>