Replace Debian gdk-pixbuf-xlib dep with libgdk-pixbuf-xlib-2.0-0

[tmancill]

libgdk-pixbuf2.0-0 is a transitional package that has been removed in the upcoming Debian 13 (trixie). This prevents balena-etcher from being installed on Debian testing and sid.

It is replaced by libgdk-pixbuf-xlib-2.0-0 has been available since Debian 11 (bullseye), released in August 2021.

See: https://packages.debian.org/unstable/libgdk-pixbuf2.0-0
See: https://packages.debian.org/unstable/libgdk-pixbuf-xlib-2.0-0

Fixes: #4398

Change-Type: patch

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[tmancill]

Do the bots need a human project maintainer to approve the workflow run?

[mroelandts]

I do receive the following information doing an apt search libgdk-pixbuf-xlib-2.0-0

libgdk-pixbuf-xlib-2.0-0/testing 2.40.2-5 amd64
GDK Pixbuf library (deprecated Xlib integration)

[tmancill]

I do receive the following information doing an apt search libgdk-pixbuf-xlib-2.0-0

libgdk-pixbuf-xlib-2.0-0/testing 2.40.2-5 amd64
GDK Pixbuf library (deprecated Xlib integration)

This is expected - the command is displaying the short description of the package, which hasn't changed in 4 years. You can refer to the debian/control file.

This PR addresses the fact that libgdk-pixbuf2.0-0 is no longer available in Debian testing and unstable at all.

That is:

run debian:testing bash -c "apt-get -qq update && apt-cache search libgdk-pixbuf2.0-0"

(no output)

and:

run debian:testing bash -c "apt-get -qq update && apt-get -y install libgdk-pixbuf2.0-0" 
Reading package lists...
Building dependency tree...
Reading state information...
Package libgdk-pixbuf2.0-0 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  libgdk-pixbuf-xlib-2.0-0

E: Package 'libgdk-pixbuf2.0-0' has no installation candidate