gnu: packages: Avoid libxml2@2.9 propagation.

libxml2@2.9 has CVEs, we don't want it in user profiles.

* gnu/packages/augeas.scm (augeas)
* gnu/packages/bioinformatics.scm (libsbml)
* gnu/packages/elf.scm (libabigail)
* gnu/packages/freedesktop.scm (telepathy-logger)
* gnu/packages/glib.scm (libaccounts-glib)
* gnu/packages/gtk.scm (gtksourceview)
* gnu/packages/image-processing.scm (vips)
* gnu/packages/mate.scm (libmateweather)
* gnu/packages/messaging.scm (libgnt)
* gnu/packages/virtualization.scm (libvirt-glib)
* gnu/packages/vpn.scm (openconnect)
* gnu/packages/xml.scm (xmlsec)
[propagated-inputs]: Replace libxml2 by libxml2-next.

Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>

gnu/packages/gtk.scm

@@ -612,7 +612,7 @@ diagrams.")
            fribidi
            glib
            gtk
-           libxml2
+           libxml2-next
            pango
            pcre2))
     (home-page "https://wiki.gnome.org/Projects/GtkSourceView")