chore(deps): update dependency verify.tunit to 31.15.0

Author: renovate[bot]

src/Directory.Packages.props

@@ -33,7 +33,7 @@
     <PackageVersion Include="ReactiveUI.Maui" Version="23.2.1" />
     <PackageVersion Include="System.Reactive" Version="6.1.0" />
     <PackageVersion Include="TUnit" Version="1.24.13" />
-    <PackageVersion Include="Verify.TUnit" Version="31.14.0" />
+    <PackageVersion Include="Verify.TUnit" Version="31.15.0" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.5.0" />
   </ItemGroup>
 </Project>