try yet another version of jupyter client

.gitlab-ci.yml

@@ -36,7 +36,7 @@ doc:
     - python --version
     - python -m pip install pip --upgrade
     - python -m pip install setuptools --upgrade
-    - python -m pip install jupyter_client
+    - python -m pip install jupyter_client==6.1.2
     - python -m pip install pymca --upgrade --pre
     - python -m pip install xraylarch
     - rm -rf artifacts