fix checkstyle

Author: panchenko

servlet/src/threadingTest/java/io/grpc/servlet/AsyncServletOutputStreamWriterConcurrencyTest.java

@@ -28,11 +28,11 @@
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.BiFunction;
+import org.jetbrains.kotlinx.lincheck.strategy.managed.modelchecking.ModelCheckingCTest;
 import org.jetbrains.lincheck.datastructures.BooleanGen;
 import org.jetbrains.lincheck.datastructures.ModelCheckingOptions;
 import org.jetbrains.lincheck.datastructures.Operation;
 import org.jetbrains.lincheck.datastructures.Param;
-import org.jetbrains.kotlinx.lincheck.strategy.managed.modelchecking.ModelCheckingCTest;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;