chore(deps): update dependency verify.tunit to 31.18.0

Author: renovate[bot]

src/Directory.Packages.props

@@ -33,7 +33,7 @@
     <PackageVersion Include="ReactiveUI.Maui" Version="23.2.27" />
     <PackageVersion Include="System.Reactive" Version="6.1.0" />
     <PackageVersion Include="TUnit" Version="1.45.29" />
-    <PackageVersion Include="Verify.TUnit" Version="31.17.0" />
+    <PackageVersion Include="Verify.TUnit" Version="31.18.0" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.5.0" />
   </ItemGroup>
 </Project>