build: bump to version 15.0.92 for the beta release

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>

meson.build

diff --git a/meson.build b/meson.build
index 0314ac0..775f0e5 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project('weston',
 	['c', 'cpp'],
-	version: '15.0.91',
+	version: '15.0.92',
 	default_options: [
 		'warning_level=3',
 		'c_std=gnu11',