community/libgedit-gtksourceview: add docbook-xsl-nons to makedepends

Fix rebuild failure due to missing non-namepsaced version of docbook-xsl
for xsl parsing.

Ref: #16579

community/libgedit-gtksourceview/APKBUILD

-# Contributor: mio <miyopan@e.email>
 # Maintainer: mio <miyopan@e.email>
+maintainer="mio <miyopan@e.email>"
 pkgname=libgedit-gtksourceview
 pkgver=299.3.0
 pkgrel=0
@@ -8,6 +8,7 @@ url="https://gitlab.gnome.org/World/gedit/libgedit-gtksourceview"
 arch="all"
 license="LGPL-2.1-or-later"
 makedepends="
+	docbook-xsl-nons
 	gobject-introspection-dev
 	gtk-doc
 	gtk+3.0-dev