[tor-bugs] #34043 [Circumvention/Snowflake]: Update snowflake to persist sessions across proxies

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#34043: Update snowflake to persist sessions across proxies
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     Reporter:  dcf                      |      Owner:  dcf
         Type:  task                     |     Status:  assigned
     Priority:  Medium                   |  Milestone:
    Component:  Circumvention/Snowflake  |    Version:
     Severity:  Normal                   |   Keywords:
Actual Points:                           |  Parent ID:
       Points:                           |   Reviewer:
      Sponsor:                           |
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 This updates snowflake for #33745 and #33897, which add Turbo Tunnel
 features to snowflake.

 There are two new dependencies, kcp-go and smux, which together make up
 the inner reliability layer. There's a patch to kcp-go to eliminate
 dependencies of features we don't use.

 This is a Tor Browser ticket but I'm putting it in Circumvention/Snowflake
 to start to see if there's anything else we want to merge at the same
 time. Maybe #34042?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34043>
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