refactor(test): remove accidentially leftover preceeding class for spy call

src/test/java/de/hftstuttgart/unifiedticketing/systems/gitlab/GitlabTicketTest.java

@@ -28,7 +28,7 @@ public class GitlabTicketTest
     @BeforeEach
     public void initBeforeEach()
     {
-        instance = Mockito.spy(new GitlabTicket(mock(GitlabTicketSystem.class)));
+        instance = spy(new GitlabTicket(mock(GitlabTicketSystem.class)));
         instance.getParent().baseUrl = "https://example.org";
 
         OkHttpClient client = mock(OkHttpClient.class);