[gtksourceview] Post-release version bump

[Christian Hergert <chergert src gnome org>]

commit ea7f2d8d1bfde6e2b7004f37d979850ef4eb5005
Author: Christian Hergert <chergert redhat com>
Date:   Wed Dec 8 15:09:37 2021 -0800

    Post-release version bump

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 4b6e31b6..24d3d021 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('gtksourceview', 'c',
-          version: '5.3.0',
+          version: '5.3.1',
           license: 'LGPL-2.1-or-later',
     meson_version: '>= 0.59.0',
   default_options: [ 'c_std=gnu99',