Update daily Linux to 20260618

Signed-off-by: root <root@portal.portal.nextcloud.com>

Author: root

config/config.php

@@ -9,7 +9,7 @@
 //
 // daily
 //
-$dailyReleaseDateLinux = '20260617';
+$dailyReleaseDateLinux = '20260618';
 $dailyReleaseDateWindows = '20260618';
 $dailyReleaseDateMacos = '20260520';