Bug 1811282: upgrade simplesaml to 1.16.3

Forgot to bump the version number for install

behatnotneeded

Change-Id: Ia767da37abc26991ab2dba51f23d9520564b35a8
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
(cherry picked from commit 15e6726a)

htdocs/auth/saml/lib.php

@@ -363,7 +363,7 @@ class PluginAuthSaml extends PluginAuth {
 
     public static function install_auth_default() {
         // Set library version to download
-        set_config_plugin('auth', 'saml', 'version', '1.15.0');
+        set_config_plugin('auth', 'saml', 'version', '1.16.3');
     }
 
     private static function create_certificates($numberofdays = 3650) {