Jean Boussier e3fc29a9b7 Improve backtrace of errors raised by Socket.tcp_with_fast_fallback
[Bug #21211]

Socket errors raised from background threads are hard to track down because
their backtrace starts from the spawned thread.

To solve this we can raise a new error with the old one as `cause`.
2025-04-02 09:16:27 -07:00
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