main/postmarketos-base-ui-gnome: add networkmanager-openrc to depends (MR 5490)

The service is enabled in the post-install script. This creates issues
like https://gitlab.com/postmarketOS/pmaports/-/jobs/7550237979

main/postmarketos-base-ui-gnome/APKBUILD

 # Maintainer: Oliver Smith <ollieparanoid@postmarketos.org>
 pkgname=postmarketos-base-ui-gnome
 pkgver=3
-pkgrel=9
+pkgrel=10
 pkgdesc="Meta package for shared configuration for GNOME-based UIs"
 url="https://postmarketos.org"
 arch="noarch"
@@ -62,6 +62,7 @@ openrc() {
 		elogind-openrc
 		iio-sensor-proxy-openrc
 		modemmanager-openrc
+		networkmanager-openrc
 		polkit-elogind
 	"