package/php: security bump version to 7.4.15

Changelog: https://www.php.net/ChangeLog-7.php#7.4.15

Fixes CVE-2021-21702: http://bugs.php.net/80672

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit c0ed274ffa6bb1373bd5004a7fe4b2cf8b30d0d7)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/php/php.hash

@@ -1,5 +1,5 @@
 # From https://www.php.net/downloads.php
-sha256  f9f3c37969fcd9006c1dbb1dd76ab53f28c698a1646fa2dde8547c3f45e02886  php-7.4.14.tar.xz
+sha256  9b859c65f0cf7b3eff9d4a28cfab719fb3d36a1db3c20d874a79b5ec44d43cb8  php-7.4.15.tar.xz
 
 # License file
 sha256  0967ad6cf4b7fe81d38709d7aaef3fecb3bd685be7eebb37b864aa34c991baa7  LICENSE

package/php/php.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-PHP_VERSION = 7.4.14
+PHP_VERSION = 7.4.15
 PHP_SITE = http://www.php.net/distributions
 PHP_SOURCE = php-$(PHP_VERSION).tar.xz
 PHP_INSTALL_STAGING = YES