`ssl.wrap_socket()` was removed in Python 3.12

[andreubotella]

The ssl.wrap_socket function has been deprecated since Python 3.7, and it was finally removed in 3.12. It would be good for pywebsocket3 to migrate to SSLContext.wrap_socket instead.

See web-platform-tests/wpt#44427 (comment) for how this affects WPT.