[gdm] meson: Update to 40.rc

[Ray Strode <halfline src gnome org>]

commit f3c23b84617ebe521acc440f987dcf7923e8972f
Author: Ray Strode <rstrode redhat com>
Date:   Tue Mar 16 16:48:04 2021 -0400

    meson: Update to 40.rc

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index e6febf69a..376a76cd1 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('gdm', 'c',
-  version: '40.beta',
+  version: '40.rc',
   license: 'GPL2+',
   meson_version: '>= 0.50',
 )