python 3.10: SSLObject does not raise SSLEOFError on OpenSSL 3

[Simon Chopin]

From https://github.com/python/cpython/issues/90471 :

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PR bpo-25309 (#25309) changed OpenSSL behavior so that it ignores unexpected EOFs by default. This was detected by the test suites of both trio and AnyIO when running on OpenSSL 3.

We worked around the problem by explicitly unsetting the SSL_OP_IGNORE_UNEXPECTED_EOF flag and then checking if the "strerror" attribute of SSLError contains the text "UNEXPECTED_EOF_WHILE_READING".

The remedy in the standard library would be twofold:

    Revert the change of enabling SSL_OP_IGNORE_UNEXPECTED_EOF by default
    Handle the condition properly so that SSLEOFError is raised instead of the generic SSLError

As SSLSockets ignore SSLEOFError by default, this fix should work fine for those too.

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There isn't any upstream PR associated with this AFAICT.