package/php: security bump to 7.2.14
Fixes the following security issue:
- CVE-2018-19935: Allows remote attackers to cause a denial of service (NULL
pointer dereference and application crash) via an empty string in the
message argument to the imap_mail function.
https://www.cvedetails.com/cve/CVE-2018-19935/
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>