Correct JUnit import in OktaOAuthAuthenticationServiceTest

Changed the import in OktaOAuthAuthenticationServiceTest.java from Junit Jupiter (org.junit.jupiter.api) to traditional JUnit (org.junit). This modification ensures better compatibility and correct functioning of assertEquals method in the tests.

pic-sure-auth-services/src/test/java/edu/harvard/hms/dbmi/avillach/auth/service/auth/OktaOAuthAuthenticationServiceTest.java

@@ -5,11 +5,10 @@
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import edu.harvard.hms.dbmi.avillach.auth.data.entity.User;
 import org.junit.Test;
-import org.mockito.Mock;
 
 import java.util.UUID;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.Assert.assertEquals;
 import static org.mockito.Mockito.when;
 
 public class OktaOAuthAuthenticationServiceTest {