Update renovate.json5

Group junit

Author: AB-xdev

renovate.json5

@@ -54,5 +54,16 @@
       ],
       "groupName": "com.vaadin"
     },
+    {
+      "description": "Group org.junit",
+      "matchPackagePatterns": [
+        "^org.junit:junit-bom",
+        "^org.junit.jupiter"
+      ],
+      "datasources": [
+        "maven"
+      ],
+      "groupName": "org.junit"
+    }
   ]
 }