Fix pubsub_server_test.py test instability
pubsub_server_test.py
test is flaky for a week.
The issue seems to have been created by the merge of !1083 (merged) even though it doesn't seem related at first sight. It is rare on public Gitlab but common on the internal one (see https://gitlab.aix.systerel.fr/produit/s2opc/S2OPC/-/jobs/95688 for example).
Edited by Vincent Lacroix