tests-extra: fix compatibility with python>=3.9

diff --git a/tests-extra/runtests.py b/tests-extra/runtests.py
index 7bd58649e9f461227dd3eb802865594e1f433ce8..d6b1ac5d35e29e7bbcd7ddad1112d51aaee93e28 100755 (executable)
--- a/tests-extra/runtests.py
+++ b/tests-extra/runtests.py
@@ -3,6 +3,7 @@
 import argparse
 import datetime
 import importlib
+import importlib.util
 import logging
 import multiprocessing
 import os