Switch to newer (supported) version of python in CI

Author: bhaettasch

.gitlab-ci.yml

@@ -1,5 +1,5 @@
 # https://hub.docker.com/r/library/python/
-image: python:3.8-buster # Python 3.8 on Debian Buster
+image: python:3.10
 
 # Change pip's cache directory to be inside the project directory since we can
 # only cache local items.