Update dependency Devlead.Testing.MockHttp to 2025.8.6.257

Author: renovate-bot

src/ARI.Tests/ARI.Tests.csproj

@@ -70,7 +70,7 @@
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="Verify.NUnit" Version="30.5.0" />
-    <PackageReference Include="Devlead.Testing.MockHttp" Version="2025.7.9.233" />
+    <PackageReference Include="Devlead.Testing.MockHttp" Version="2025.8.6.257" />
     <PackageReference Include="Cake.Testing" Version="5.0.0" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
   </ItemGroup>