chore(deps): update dependency reactiveui.validation to v4

Author: renovate[bot]

src/Camelotia.Presentation/Camelotia.Presentation.csproj

@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="ReactiveUI.Fody" Version="18.4.44" />
-    <PackageReference Include="ReactiveUI.Validation" Version="3.1.7" />
+    <PackageReference Include="ReactiveUI.Validation" Version="4.1.1" />
   </ItemGroup>
 
 </Project>