[issue20421] expose SSL socket protocol version

[Antoine Pitrou]

Antoine Pitrou added the comment:

Ok, it came to me that converting to one of the PROTOCOL* constants can fail in the following case: Python is linked with an OpenSSL that supports a more recent protocol version than the ssl module is aware of. SSL_get_version() can then return a protocol (e.g. "TLSv1.3") that we don't know about, and have no way of converting to an existing constant.

So perhaps we should really simply return the same string as OpenSSL?

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