Migration to bookworm
This migration imply several different this:
- that we have a ready to use bookworm image for cubicweb (should be good)
- that all employees that use debian migrate to bookworm
- that we decided to drop the support of python 3.7 to switch to python 3.11 (major release!)
- that our clients projects migrate to bookworm python 3.11
- that we migrate to nodejs 20 (or 18?) and decide which version of nodejs we support
- that we ensure that 3.11 is supported on CubicWeb (normally this is ok but things might have broke in the meantime)
- that the CI uses the bookworm images for CubicWeb and the cubes and the clients and internal projects