Update LDAP.php (#1378)

Minor typo. Frist replaced everything in my project and then saw the typo :|

lib/SimpleSAML/Auth/LDAP.php

@@ -4,7 +4,7 @@ declare(strict_types=1);
 
 namespace SimpleSAML\Auth;
 
-\SimpleSAML\Logger::warning("The class \SimpleSAML\Auth\LDAP has been moved to the ldap module, please use \SimpleSAML\Module\saml\Auth\Ldap instead.");
+\SimpleSAML\Logger::warning("The class \SimpleSAML\Auth\LDAP has been moved to the ldap module, please use \SimpleSAML\Module\ldap\Auth\Ldap instead.");
 
 /**
  * @deprecated To be removed in 2.0