[gnome-builder/wip/gtk4-port] build: bump GTK requirement

[Christian Hergert <chergert src gnome org>]

commit 6c1c1806a9b775e83bb018f1feedb2bf89193272
Author: Christian Hergert <chergert redhat com>
Date:   Mon May 2 14:33:26 2022 -0700

    build: bump GTK requirement
    
    So that we can test with patches ontop of GTK for incoming features we
    would like to be using.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 27d5620a5..4ee62a05a 100644
--- a/meson.build
+++ b/meson.build
@@ -23,7 +23,7 @@ pkgtypelibdir = join_paths(get_option('libdir'), 'gnome-builder', 'girepository-
 
 # Check dependencies
 glib_req_version = '2.70.0'
-gtk_req_version = '4.6'
+gtk_req_version = '4.7'
 gtksourceview_req_version = '5.5'
 
 glib_req = '>= @0@'.format(glib_req_version)