chore: Fix lint issues

Author: lqiu96

appengine/javatests/com/google/auth/appengine/AppEngineCredentialsTest.java

@@ -33,7 +33,6 @@
 
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertNotSame;

oauth2_http/javatests/com/google/auth/oauth2/AppEngineCredentialsTest.java

@@ -61,8 +61,7 @@ class AppEngineCredentialsTest extends BaseSerializationTest {
 
   private static final Collection<String> SCOPES =
       Collections.unmodifiableCollection(Arrays.asList("scope1", "scope2"));
-  private static final Collection<String> DEFAULT_SCOPES =
-      Collections.singletonList("scope3");
+  private static final Collection<String> DEFAULT_SCOPES = Collections.singletonList("scope3");
 
   @Test
   void constructor_usesAppIdentityService() throws IOException {