postmarketos-anbox: Add nftables subpackage dependency (MR 2271)

The subpackage adds rules specific to Anbox to allow in- and outbound
network traffic over the `anbox0` network bridge.

main/postmarketos-anbox/APKBUILD

 # Maintainer: Antoine Fontaine <antoine.fontaine@epfl.ch>
 pkgname=postmarketos-anbox
 pkgver=0
-pkgrel=0
+pkgrel=1
 pkgdesc="Android in a box: postmarketos metapackage"
 arch="x86_64 armv7 aarch64"
 url="https://wiki.postmarketos.org/wiki/Anbox"
 license="GPL-3.0-or-later"
 options="!check"
 install="$pkgname.post-install"
-depends="anbox anbox-image"
+depends="anbox anbox-image postmarketos-config-nftables-anbox"
 
 package() {
 	mkdir -p "$pkgdir"