Update dependency Microsoft.NET.Test.Sdk to v18

Author: renovate[bot]

AngleSharp.ContentExtraction.IntegrationTests/AngleSharp.ContentExtraction.IntegrationTests.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="nunit" Version="4.4.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="5.1.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
   </ItemGroup>
 
   <ItemGroup>