Bump ReactiveUI.XamForms from 18.2.5 to 18.3.1 in /src (#93)

Bumps [ReactiveUI.XamForms](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.XamForms
  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.Xamarin.Android/Camelotia.Presentation.Xamarin.Droid.csproj

@@ -56,7 +56,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="ReactiveUI.XamForms" Version="18.2.5" />
+    <PackageReference Include="ReactiveUI.XamForms" Version="18.3.1" />
     <PackageReference Include="Xamarin.Plugin.FilePicker" Version="2.1.41" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
     <PackageReference Include="Xamarin.Android.Support.Compat" Version="28.0.0.3" />

src/Camelotia.Presentation.Xamarin/Camelotia.Presentation.Xamarin.csproj

@@ -11,7 +11,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="ReactiveUI.XamForms" Version="18.2.5" />
+    <PackageReference Include="ReactiveUI.XamForms" Version="18.3.1" />
     <PackageReference Include="Xamarin.Forms" Version="5.0.0.2478" />
     <PackageReference Include="Xam.Plugin.Iconize.FontAwesome" Version="3.5.0.129" />
     <PackageReference Include="ReactiveMarbles.ObservableEvents.SourceGenerator" Version="1.1.4" PrivateAssets="all" />