Make libffi version more flexible (#7734) (#7738)

* Make libffi version more flexible
Can not install on debian 12
Fixes #6036

* target v11 packaging on v12 install
we are only targeting one version per debian / ubuntu channel. This should not present a problem

(cherry picked from commit 4edea65e00)

Co-authored-by: Matthias Mair <code@mjmair.com>

.pkgr.yml

@@ -32,7 +32,7 @@ dependencies:
   - gettext
   - nginx
   - jq
-  - libffi7
+  - "libffi7 | libffi8"
 targets:
   ubuntu-20.04: true
   debian-11: true