Pre-release version bump to 0.43.0

Signed-off-by: Simon Ser <contact@emersion.fr>
diff --git a/meson.build b/meson.build
index 5c896ac..285373d 100644
--- a/meson.build
+++ b/meson.build
@@ -21,7 +21,7 @@
 project(
   'pixman',
   ['c'],
-  version : '0.42.3',
+  version : '0.43.0',
   license : 'MIT',
   meson_version : '>= 0.52.0',
   default_options : ['c_std=gnu99', 'buildtype=debugoptimized'],