Issue ERR - Warnings with SSH Keys Manager

[Brujo]

Ubuntu 16.04 & 18.04
Plesk Obsidian Version 18.0.24 & Plesk Onyx Version 17.8.11 Update #83

panel.log full with this warnings when the ssh key manager extension is used

[2020-02-29 08:55:55.777] ERR [panel] PHP Warning: Declaration of Modules_SshKeys_FileManager::mkdir($path, $permissions) should be compatible with pm_FileManager::mkdir($dirname, $perms = '0755', $recursively = false); File: /opt/psa/admin/plib/modules/ssh-keys/library/FileManager.php, Line: 4