Xdebug 2.9.0 is installed on dev machines

[MKodde]

I noticed Xdebug 2.9 is installed on the dev containers. But Xdebug 3 ini settings are used. May I suggest installing:

• Xdebug 3.1 on the php72 containers
• Xdebug 3.3 on the php82 containers

See: https://xdebug.org/docs/compat for a version compatibility (and maintenance window) matrix

The clear advantage is that we can use the same xdebug.ini settings for both PHP flavors. Quite a lot of config settings changed between Xdebug 2 and 3.