[Misc] Don't mix junit4 and junit5 APIs

xwiki-platform-core/xwiki-platform-test/xwiki-platform-test-upgrade/src/main/java/org/xwiki/test/ui/UpgradeTest.java

@@ -56,10 +56,10 @@
 import org.xwiki.test.integration.junit.LogCaptureValidator;
 import org.xwiki.test.ui.po.ViewPage;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-import static org.junit.jupiter.api.Assertions.fail;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
 
 /**
  * Validate the Distribution Wizard part of the upgrade process.