package/php: security bump to version 7.2.3

Fixes CVE 2018-7584: https://bugs.php.net/bug.php?id=75981

For details see release notes:
http://www.php.net/archive/2018.php#id2018-03-01-2



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>