build: Bump gjs requirement

While we don't actually require a more recent version at build time,
we do need the latest stable version at runtime. There's no strong
reason for making that differentiation, so bump the requirement.

https://gitlab.gnome.org/GNOME/gnome-shell/issues/1006

meson.build

@@ -20,7 +20,7 @@ gcr_req = '>= 3.7.5'
 gdesktop_req = '>= 3.7.90'
 gio_req = '>= 2.56.0'
 gi_req = '>= 1.49.1'
-gjs_req = '>= 1.47.0'
+gjs_req = '>= 1.54.0'
 gtk_req = '>= 3.15.0'
 json_glib_req = '>= 0.13.2'
 mutter_req = '>= 3.31.91'