set version to 2.2.7 for upcoming release

Signed-off-by: Michael Kaufmann <d00p@froxlor.org>

install/froxlor.sql.php

@@ -733,7 +733,7 @@ opcache.validate_timestamps'),
 	('panel', 'logo_overridecustom', '0'),
 	('panel', 'settings_mode', '0'),
 	('panel', 'menu_collapsed', '1'),
-	('panel', 'version', '2.2.6'),
+	('panel', 'version', '2.2.7'),
 	('panel', 'db_version', '202412030');