[Debian-on-mobile-maintainers] Bug#1075829: phosh-core: Depends on squeekboard from experimental

[Jeremy Bícha]

Package: phosh-core
Version: 40

phosh-core has Depends: squeekboard (>= 1.38.0) | phosh-osk-stub (>= 0.38.0)

but squeekboard 1.38 is only in Experimental.

Additionally, squeekboard is not in Testing. Matthias Geiger had an
idea of vendoring rust-gtk (gtk3), but it has proven more difficult to
do that for squeekboard than it was for qwertone where he prepared a
merge request.

Thank you,
Jeremy Bícha