Bug#1019269: gnome-books: Adapt to libgepub 0.7

[Jeremy Bicha]

Source: gnome-books
Version: 40.0-3
Severity: serious
Tags: bookworm sid ftbfs

gnome-books needs to be updated to build against libgepub 0.7. This is
probably a fairly simple change except that
https://bugs.debian.org/1015138 is a bit awkward to deal with.

GNOME doesn't support GNOME Books any more. The recommended
replacement app is Foliate.

Thank you,
Jeremy Bicha