Fix code smell

Signed-off-by: Florian Dupuy <[email protected]>

dynawaltz/src/test/java/com/powsybl/dynawaltz/builders/BuilderConfigTest.java

@@ -20,7 +20,7 @@
 /**
  * @author Laurent Issertial {@literal <laurent.issertial at rte-france.com>}
  */
-public class BuilderConfigTest {
+class BuilderConfigTest {
 
     private static Network NETWORK;
     private static ModelConfigsHandler MODEL_CONFIGS_HANDLER;