Remove unnecessary using directive

Author: Sergio0694

components/DependencyPropertyGenerator/CommunityToolkit.DependencyPropertyGenerator.Tests/Test_UseGeneratedDependencyPropertyOnManualPropertyCodeFixer.cs

@@ -13,10 +13,6 @@
 using CSharpCodeFixTest = CommunityToolkit.GeneratedDependencyProperty.Tests.Helpers.CSharpCodeFixTest<
     CommunityToolkit.GeneratedDependencyProperty.UseGeneratedDependencyPropertyOnManualPropertyAnalyzer,
     CommunityToolkit.GeneratedDependencyProperty.UseGeneratedDependencyPropertyOnManualPropertyCodeFixer>;
-using VerifyCS = Microsoft.CodeAnalysis.CSharp.Testing.CSharpCodeFixVerifier<
-    CommunityToolkit.GeneratedDependencyProperty.UseGeneratedDependencyPropertyOnManualPropertyAnalyzer,
-    CommunityToolkit.GeneratedDependencyProperty.UseGeneratedDependencyPropertyOnManualPropertyCodeFixer,
-    Microsoft.CodeAnalysis.Testing.DefaultVerifier>;
 
 namespace CommunityToolkit.GeneratedDependencyProperty.Tests;