Fixup Undertow package import

Author: philwebb

spring-boot-project/spring-boot-undertow/src/test/java/org/springframework/boot/undertow/servlet/autoconfigure/UndertowServletWebServerServletContextListenerTests.java

@@ -18,8 +18,8 @@
 
 import jakarta.servlet.ServletContextListener;
 
-import org.springframework.boot.autoconfigure.web.server.servlet.AbstractServletWebServerServletContextListenerTests;
 import org.springframework.boot.undertow.servlet.UndertowServletWebServerFactory;
+import org.springframework.boot.web.server.servlet.AbstractServletWebServerServletContextListenerTests;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;