install newer obfs4proxy on polyanthum
This is a similar ticket to #40758 (closed)
We currently have obfs4proxy 0.0.8 installed on bridges.tpo. And we use that obfs4proxy to test obfs4 reachability of all the bridges.
But because of tpo/applications/tor-browser#40804 (closed), we are testing with an old and buggy and only partly compatible obfs4!
The obfs4 version in Tor Browser is 0.0.12, which means Tor clients are getting the new better handshake.
We should move bridgestrap so it tests obfs4 bridges using the same handshake that Tor Browser users will attempt.
And the way we do that is by upgrading the obfs4proxy package.
https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/obfs4/-/issues/33736#note_2786764 says that as of some months ago, obfs4proxy 0.0.13 is in bullseye-backports.
Does that mean we just add a line to the puppet stanza and we're there? :)
[Cc'ing @meskio so he knows about the ticket]