fixes #1231 - format test with mvn spotless:apply

Author: anthonydahanne

cloudfoundry-client/src/test/java/org/cloudfoundry/client/v3/RelationshipTest.java

@@ -18,8 +18,6 @@
 
 import org.junit.jupiter.api.Test;
 
-import static org.assertj.core.api.Assertions.assertThat;
-
 final class RelationshipTest {
 
     @Test