Bump phpmailer/phpmailer from 6.1.4 to 6.1.6

Bumps [phpmailer/phpmailer](https://github.com/PHPMailer/PHPMailer) from 6.1.4 to 6.1.6.
- [Release notes](https://github.com/PHPMailer/PHPMailer/releases)
- [Changelog](https://github.com/PHPMailer/PHPMailer/blob/master/changelog.md)
- [Commits](https://github.com/PHPMailer/PHPMailer/compare/v6.1.4...v6.1.6)

Signed-off-by: dependabot[bot] <support@github.com>

composer.lock

@@ -139,16 +139,16 @@
         },
         {
             "name": "phpmailer/phpmailer",
-            "version": "v6.1.4",
+            "version": "v6.1.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPMailer/PHPMailer.git",
-                "reference": "c5e61d0729507049cec9673aa1a679f9adefd683"
+                "reference": "c2796cb1cb99d7717290b48c4e6f32cb6c60b7b3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/c5e61d0729507049cec9673aa1a679f9adefd683",
-                "reference": "c5e61d0729507049cec9673aa1a679f9adefd683",
+                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/c2796cb1cb99d7717290b48c4e6f32cb6c60b7b3",
+                "reference": "c2796cb1cb99d7717290b48c4e6f32cb6c60b7b3",
                 "shasum": ""
             },
             "require": {
@@ -197,7 +197,7 @@
                 }
             ],
             "description": "PHPMailer is a full-featured email creation and transfer class for PHP",
-            "time": "2019-12-10T11:17:38+00:00"
+            "time": "2020-05-27T12:24:03+00:00"
         },
         {
             "name": "psr/log",
@@ -2849,6 +2849,7 @@
                 }
             ],
             "description": "An XSL wrapper / extension to the PHP 5.x XSLTProcessor with Exception and extended Callback support",
+            "abandoned": true,
             "time": "2014-11-27T20:08:52+00:00"
         },
         {