The libcamera0.7 package declares a fixed versioned Recommends on the
same version of libcamera-ipa (as do older versions).

This breaks smoothed transitions to newer versions of libcamera,
because old versions will lose access to the -ipa functionality
when an upgrade is forced.

Upgrades from libcamera0.6 to libcamera0.7 are broken as the solver
sees a single version for libcamera0.6, marks that for install, and
then proceeds to walk the satisfied Recommends on the = 0.6 version
of libcamera-ipa, preventing it from later upgrading it.

This may change once all libcamera0.6 reverse dependencies have been
rebuilt (so we select their latest version and hence libcamera0.7 for
install), but before that, we'd always select libcamera0.6.