we added flaky to the pyopenssl test deps... (#3759)

* we added flaky to the pyopenssl test deps...

* we can just use the test extra now
diff --git a/Jenkinsfile b/Jenkinsfile
index fab5de7..3492b54 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -104,8 +104,7 @@
             virtualenv .venv
             source .venv/bin/activate
             pip install ../cryptography
-            pip install -e .
-            pip install pytest pretend
+            pip install -e .[test]
             pytest tests
         """
     ],