Log Message:
nginx-devel: updated to 1.21.6

Changes with nginx 1.21.6                                        25 Jan 2022

    *) Bugfix: when using EPOLLEXCLUSIVE on Linux client connections were
       unevenly distributed among worker processes.

    *) Bugfix: nginx returned the "Connection: keep-alive" header line in
       responses during graceful shutdown of old worker processes.

    *) Bugfix: in the "ssl_session_ticket_key" when using TLSv1.3.