Fix RequireUpperBoundDeps issue

```
WARNING] Rule 3: org.apache.maven.plugins.enforcer.RequireUpperBoundDeps fai
Failed while enforcing RequireUpperBoundDeps. The error(s) are [
Require upper bound dependencies error for org.objenesis:objenesis:2.1 paths
+-org.jenkins-ci.main:test:2.92-SNAPSHOT
  +-org.mockito:mockito-core:1.10.19
    +-org.objenesis:objenesis:2.1
and
+-org.jenkins-ci.main:test:2.92-SNAPSHOT
  +-org.awaitility:awaitility:3.0.0
    +-org.objenesis:objenesis:2.5.1
```

test/pom.xml

@@ -204,6 +204,12 @@ THE SOFTWARE.
       <version>3.0.0</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.objenesis</groupId>
+      <artifactId>objenesis</artifactId>
+      <version>2.5.1</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>