dep: bump phpipam version to latest v1.6.0 tag

Author: txj-xyz

Dockerfile

@@ -2,7 +2,7 @@ FROM php:7.2-apache
 MAINTAINER Pierre Cheynier <pierre.cheynier@gmail.com>
 
 ENV PHPIPAM_SOURCE https://github.com/phpipam/phpipam/
-ARG PHPIPAM_VERSION=1.5.2
+ARG PHPIPAM_VERSION=1.6.0
 ENV PHPMAILER_SOURCE https://github.com/PHPMailer/PHPMailer/
 ARG PHPMAILER_VERSION=6.7.1
 ENV PHPSAML_SOURCE https://github.com/onelogin/php-saml/