Bump ReactiveUI.WPF from 18.2.5 to 18.3.1 in /src (#90)

Bumps [ReactiveUI.WPF](https://github.com/reactiveui/reactiveui) from 18.2.5 to 18.3.1.
- [Release notes](https://github.com/reactiveui/reactiveui/releases)
- [Commits](https://github.com/reactiveui/reactiveui/compare/18.2.5...18.3.1)

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

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

src/Camelotia.Presentation.Wpf/Camelotia.Presentation.Wpf.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="MaterialDesignColors" Version="2.0.6" />
     <PackageReference Include="MaterialDesignThemes" Version="4.5.0" />
     <PackageReference Include="MaterialDesignThemes.MahApps" Version="0.2.2" />
-    <PackageReference Include="ReactiveUI.WPF" Version="18.2.5" />
+    <PackageReference Include="ReactiveUI.WPF" Version="18.3.1" />
     <PackageReference Include="ReactiveMarbles.ObservableEvents.SourceGenerator" Version="1.1.4" PrivateAssets="all" />
   </ItemGroup>
   <ItemGroup>