test(backend): Remove public identifier to make sonar happy #2

Author: Manuel

backend/src/test/java/ch/puzzle/pcts/mapper/ExampleMapperIT.java

@@ -11,7 +11,7 @@
 import org.mockito.InjectMocks;
 import org.mockito.MockitoAnnotations;
 
-public class ExampleMapperIT {
+class ExampleMapperIT {
     @InjectMocks
     private ExampleMapper mapper;