[mutter] Change upcoming version (again)

[Florian Müllner <fmuellner src gnome org>]

commit 5be763e21a2c3cd3a13c15ac828a8af35d0a5d44
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Dec 25 23:25:01 2020 +0100

    Change upcoming version (again)
    
    The extension website doesn't handle the chosen scheme correctly,
    so use 40.alpha.1 instead.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 17c4368193..665b4fce33 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('mutter', 'c',
-  version: '40.alpha2',
+  version: '40.alpha.1',
   meson_version: '>= 0.51.0',
   license: 'GPLv2+'
 )