Bump python 39

This MR updates all projects and template files to compile for Python 3.9 and 3.10 only.

Python 3.8 is dead - long live Python 3.10.

bob/devtools/data/gitlab-ci/beat-docker-package.yaml

-build_linux_38:
+build_linux_39:
   tags:
     - bob
     - linux
     - docker-build
 
-build_linux_39:
+build_linux_310:
   tags:
     - bob
     - linux