chore(deps): update dependency verify.nunit to 30.15.0

Author: renovate[bot]

src/Directory.Packages.props

@@ -44,7 +44,7 @@
     <PackageVersion Include="System.IO.FileSystem.Primitives" Version="4.3.0" />
     <PackageVersion Include="System.Runtime.Serialization.Primitives" Version="4.3.0" />
     <PackageVersion Include="System.Text.Json" Version="9.0.9" />
-    <PackageVersion Include="Verify.NUnit" Version="30.13.0" />
+    <PackageVersion Include="Verify.NUnit" Version="30.15.0" />
     <PackageVersion Include="Microsoft.Windows.CsWinRT" Version="2.3.0-prerelease.250720.1" />
     <PackageVersion Include="Microsoft.AspNetCore.Components" Version="$(AspNetVersion)" />
     <PackageVersion Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />