chore(deps): update dependency verify.tunit to 31.20.0 (#444)

chore(deps): update .net test stack

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

Author: renovate[bot]

src/Directory.Packages.props

@@ -33,7 +33,7 @@
     <PackageVersion Include="ReactiveUI.Maui" Version="23.2.28" />
     <PackageVersion Include="System.Reactive" Version="6.1.0" />
     <PackageVersion Include="TUnit" Version="1.56.18" />
-    <PackageVersion Include="Verify.TUnit" Version="31.19.1" />
+    <PackageVersion Include="Verify.TUnit" Version="31.20.0" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.5.0" />
   </ItemGroup>
 </Project>