Adapt Gradle plugin tests to change in Kotlin's packaging

Closes gh-16554

Author: wilkinsona

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/testkit/GradleBuild.java

@@ -33,6 +33,7 @@
 import org.gradle.testkit.runner.BuildResult;
 import org.gradle.testkit.runner.GradleRunner;
 import org.jetbrains.kotlin.cli.common.PropertiesKt;
+import org.jetbrains.kotlin.compilerRunner.KotlinLogger;
 import org.jetbrains.kotlin.gradle.model.KotlinProject;
 import org.jetbrains.kotlin.gradle.plugin.KotlinGradleSubplugin;
 import org.jetbrains.kotlin.gradle.plugin.KotlinPlugin;
@@ -138,6 +139,7 @@ private List<File> pluginClasspath() {
 				new File(pathOfJarContaining(ClassVisitor.class)),
 				new File(pathOfJarContaining(DependencyManagementPlugin.class)),
 				new File(pathOfJarContaining(PropertiesKt.class)),
+				new File(pathOfJarContaining(KotlinLogger.class)),
 				new File(pathOfJarContaining(KotlinPlugin.class)),
 				new File(pathOfJarContaining(KotlinProject.class)),
 				new File(pathOfJarContaining(KotlinGradleSubplugin.class)),