Stick to JUnit 5.x

JUnit 6 requires Java 17.

Author: acogoluegnes

.github/dependabot.yml

@@ -13,8 +13,10 @@ updates:
         versions: [ "[2.0,)" ]
       - dependency-name: "ch.qos.logback:logback-classic"
         versions: [ "[1.3,)" ]
+      - dependency-name: "org.junit:*"
+        versions: [ "[6.0,)" ]
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "daily"
-    target-branch: "main"
+    target-branch: "main"