Update src/UnitTestEx/Abstractions/TesterBase.cs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Eric Sibly [chullybun] <eric@thesiblys.com>

Author: chullybun

src/UnitTestEx/Abstractions/TesterBase.cs

@@ -15,7 +15,6 @@
 using System.Reflection;
 using System.Text;
 using System.Threading;
-using UnitTestEx.AspNetCore;
 using UnitTestEx.Expectations;
 using UnitTestEx.Json;
 using UnitTestEx.Logging;