Fix the maven and gradle integration tests.

plugin-gradle/src/test/java/com/diffplug/gradle/spotless/Antlr4ExtensionTest.java

@@ -19,7 +19,7 @@
 
 import org.junit.Test;
 
-public class Antlr4ExtensionTest extends GradleIntegrationTest {
+public class Antlr4ExtensionTest extends GradleIntegrationHarness {
 
 	@Test
 	public void applyUsingDefaultVersion() throws IOException {

plugin-maven/src/test/java/com/diffplug/spotless/maven/antlr4/Antlr4FormatterTest.java

@@ -17,9 +17,9 @@
 
 import org.junit.Test;
 
-import com.diffplug.spotless.maven.MavenIntegrationTest;
+import com.diffplug.spotless.maven.MavenIntegrationHarness;
 
-public class Antlr4FormatterTest extends MavenIntegrationTest {
+public class Antlr4FormatterTest extends MavenIntegrationHarness {
 
 	@Test
 	public void applyUsingCustomVersion() throws Exception {