[mutter/gnome-40] Bump version to 40.4

[Florian Müllner <fmuellner src gnome org>]

commit 2bfef7dbdc6f432a5433c93c1fcdbf00099367c8
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Aug 18 01:04:55 2021 +0200

    Bump version to 40.4
    
    Update NEWS.

 NEWS        | 12 ++++++++++++
 meson.build |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)
---
diff --git a/NEWS b/NEWS
index d657d10833..fc86a6dcde 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,15 @@
+40.4
+====
+* Don't require a newly attached buffer to apply state [Christian, Jonas; !1795]
+* Fix upside-down Xshape surface with EGLstream [Robert; !1937]
+* Misc. bug fixes and cleanups [Jonas; !1942, !1912]
+
+Contributors:
+  Robert Mader, Christian Rauch, Jonas Ådahl
+
+Translators:
+  Marek Černocký [cs]
+
 40.3
 ====
 * Fix area screencasts when window is unredirected [Michel; #1707]
diff --git a/meson.build b/meson.build
index 7ca0a9817b..1f224bb85c 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('mutter', 'c',
-  version: '40.3',
+  version: '40.4',
   meson_version: '>= 0.51.0',
   license: 'GPLv2+'
 )