Do we have any pre-Dec2021 standalone snowflakes still? If so stop using them
Part of our Dec 2021 plan, when Russia blocked our pion webrtc traffic by DPI, was to get everybody to upgrade. The browser extension snowflakes don't use pion so they're immune, and the client side was handled by upgrading Tor Browser.
That left the standalone snowflakes. There are tickets like #32677 which are about how to communicate with standalone snowflake operators, how to get messages to them, how to make it easier for them to upgrade. But this ticket is much smaller in scope:
If people are still running standalone snowflakes that use the pion from before Dec 2021, we should decide, at the broker, to not make use of them.
(My notes from Dec 2021 say that standalone snowflakes say their version when they ask the broker if anybody needs a connect-back, so I am hoping this is an easy task. If it isn't easy, maybe we should triage it away and instead focus on making it easy next time.)