switch installers to bookworm

as part of the %Debian 12 bookworm upgrade milestone, we should switch the installers to setup only new bookworm machines from now on.

ganeti: @lavamind added this to hiera/common.yaml, but maybe it should be made upstream as well:
```
ganeti::debootstrap_variants:
  bookworm:
    suite: "bookworm"
```
- @lavamind fix Puppetfile to point at https://gitlab.com/shared-puppet-modules-group/puppet-ganeti/-/commit/ff3814b6572dc03621fcd6027d23c89f55a7fe8f
wiki instructions (wiki-replica@c97207ab)
fabric_tpa

Edited Jul 04, 2023 by Jérôme Charaoui

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