Steps to reproduce the issue

set PHP Version 7.1.6 and update to J3.7.3

Expected result

ok

Actual result

Your PHP Version Will Be Unsupported in Joomla! 3.3
Since version 3.2.2
Beginning with Joomla! 3.3, the version of PHP this site is using will no longer be supported. Joomla! 3.3 will require at least PHP version 5.3.10 in order to provide enhanced security features to its users.

System information (as much as possible)

PHP Built On Linux xxxxxxx 3.10.0-042stab123.3 #1 SMP Fri May 5 12:29:05 MSK 2017 x86_64
Database Version 5.5.5-10.1.24-MariaDB
Database Collation utf8_general_ci
Database Connection Collation utf8mb4_general_ci
PHP Version 7.1.6
Web Server Apache
WebServer to PHP Interface fpm-fcgi
Joomla! Version Joomla! 3.7.3 Stable [ Amani ] 4-July-2017 08:03 GMT
Joomla! Platform Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
User Agent Mozilla/5.0 (Windows NT 10.0; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0

Additional comments