tests: raise retries for logging tests

As for now, sometimes the test checking the
logging pipeline fails because we're not waiting
enough.
We now wait 2 minutes, it should avoid flakies.

tests/post/steps/test_logging.py

@@ -192,7 +192,7 @@ def _check_log_line_exists():
 
     utils.retry(
         _check_log_line_exists,
-        times=20,
+        times=40,
         wait=3,
         name="check that a log exists for 'logger' pod"
     )