Build images with ubuntu-20.04 and python-3.10

Author: mathbunnyru

base-notebook/Dockerfile

@@ -85,7 +85,7 @@ RUN echo "auth requisite pam_deny.so" >> /etc/pam.d/su && \
 USER ${NB_UID}
 
 # Pin python version here, or set it to "default"
-ARG PYTHON_VERSION=3.9
+ARG PYTHON_VERSION=3.10
 
 # Setup work directory for backward-compatibility
 RUN mkdir "/home/${NB_USER}/work" && \

tests/base-notebook/test_python.py

@@ -5,7 +5,7 @@
 from tests.conftest import TrackedContainer
 
 LOGGER = logging.getLogger(__name__)
-EXPECTED_PYTHON_VERSION = "3.9"
+EXPECTED_PYTHON_VERSION = "3.10"
 
 
 def test_python_version(container: TrackedContainer) -> None: