[gdm] meson: Bump to 40.beta

[Ray Strode <halfline src gnome org>]

commit 5f53d37e698f28412e7ce61f0c03241185573c47
Author: Ray Strode <rstrode redhat com>
Date:   Thu Feb 25 14:54:27 2021 -0500

    meson: Bump to 40.beta

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 1ab4ea29f..e6febf69a 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('gdm', 'c',
-  version: '3.38.1',
+  version: '40.beta',
   license: 'GPL2+',
   meson_version: '>= 0.50',
 )