[gnome-control-center] build: Bump minimum version of GLib.

[Robert Ancell <rancell src gnome org>]

commit d01a81a14043bca179a370e458dcc1b3900811e2
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue Dec 17 16:08:27 2019 +1300

    build: Bump minimum version of GLib.
    
    We are already using g_clear_handle_id, which requires GLib 2.56

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 5b97081c6..253804e61 100644
--- a/meson.build
+++ b/meson.build
@@ -120,7 +120,7 @@ accounts_dep = dependency('accountsservice', version: '>= 0.6.39')
 colord_dep = dependency('colord', version: '>= 0.1.34')
 gdk_pixbuf_dep = dependency('gdk-pixbuf-2.0', version: '>= 2.23.0')
 gio_dep = dependency('gio-2.0')
-glib_dep = dependency('glib-2.0', version: '>= 2.53.0')
+glib_dep = dependency('glib-2.0', version: '>= 2.56.0')
 gnome_desktop_dep = dependency('gnome-desktop-3.0', version: '>= 3.27.90')
 gnome_settings_dep = dependency('gnome-settings-daemon', version: '>= 3.27.90')
 goa_dep = dependency('goa-1.0', version: goa_req_version)