chore(deps): update dependency reactiveui.testing to 20.3.1 (#291)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/Directory.Build.props

@@ -50,7 +50,7 @@
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="FluentAssertions" Version="8.3.0" />
-    <PackageReference Include="ReactiveUI.Testing" Version="20.2.45" />
+    <PackageReference Include="ReactiveUI.Testing" Version="20.3.1" />
   </ItemGroup>
 
    <PropertyGroup>