fix(e2e): pin junit-vintage-engine to 5.11.4 for surefire compatibility

Author: Copilot

e2e/pom.xml

@@ -59,7 +59,7 @@
         <dependency>
             <groupId>org.junit.vintage</groupId>
             <artifactId>junit-vintage-engine</artifactId>
-            <version>6.1.0</version>
+            <version>5.11.4</version>
             <scope>test</scope>
         </dependency>
         <dependency>