meson: Require gio-2.0 >= 2.74

[ryonakano]

We now use GLib.ListStore.n_items since #326:

     private void check_vpn_availability () {
-        show_vpn (vpn_list.get_child_at_index (0) != null);
+        show_vpn (vpn_list.n_items > 0);
     }

This is available on gio-2.0 >= 2.74 as written in Valadoc, so make sure to require it. Also explicit that we require libnm-dev >= 1.24 in README

---

I noticed this because the daily recipe of wingpanel-indicator-network fails in Jammy:

https://code.launchpad.net/~elementary-os/+archive/ubuntu/daily/+build/30646060

../src/Widgets/VpnInterface.vala:57.19-57.34: error: `GLib.ListStore.n_items' is not available in gio-2.0 2.72.4. Use gio-2.0 >= 2.74
   57 |         show_vpn (vpn_list.n_items > 0);
      |                   ^~~~~~~~~~~~~~~~      
Compilation failed: 1 error(s), 0 warning(s)
ninja: build stopped: subcommand failed.

Our development target is now Noble, so I dropped Jammy from the above recipe.

[ryonakano]

I also changed recipes for stable:

• Renamed wingpanel-indicator-network-stable recipe which builds from the horus branch of this repository to wingpanel-indicator-network-horus
• Drop Noble from the distribution series of wingpanel-indicator-network-horus
• Created a new branch named noble from horus branch in this repository
• Created a new recipe for Noble: wingpanel-indicator-network-noble which builds from the noble branch of this repository

[leonardo-lemos]

Good catch!