update phpseclib

Author: simonLeary42

composer.json

@@ -1,7 +1,7 @@
 {
     "require": {
         "psr/log": "1.1.4",
-        "phpseclib/phpseclib": "3.0.16",
+        "phpseclib/phpseclib": "3.0.43",
         "phpmailer/phpmailer": "6.9.3",
         "hakasapl/phpopenldaper": "1.0.5"
     }