community/amtk: add docbook-xsl-nons to makedepends

Fix rebuild failure due to missing non-namepsaced version of `docbook-xsl`
for xsl parsing by explicitly including the `-nons` subpackage.

Ref: #16579

community/amtk/APKBUILD

@@ -7,7 +7,8 @@ pkgdesc="Actions, Menus and Toolbars Kit for GTK+ applications"
 url="https://wiki.gnome.org/Projects/Amtk"
 arch="all"
 license="LGPL-2.1-or-later"
-makedepends="gtk-doc gtk+3.0-dev glib-dev gobject-introspection-dev meson"
+makedepends="docbook-xsl-nons gtk-doc gtk+3.0-dev glib-dev
+	gobject-introspection-dev meson"
 subpackages="$pkgname-dev $pkgname-lang $pkgname-doc"
 source="https://download.gnome.org/sources/amtk/${pkgver%.*}/amtk-$pkgver.tar.xz"