XEP-0480: SASL Upgrade Tasks

[Neustradamus]

Can you add "XEP-0480: SASL Upgrade Tasks" support?

• https://xmpp.org/extensions/xep-0480.html

Linked to:

• #539
• #545
• #546
• #551
• #554
• https://notes.valdikss.org.ru/jabber.ru-mitm/
• https://snikket.org/blog/on-the-jabber-ru-mitm/
• https://www.devever.net/~hl/xmpp-incident
• https://blog.jmp.chat/b/certwatch