pythongh-148292: Remove shutdown() test in test_ssl.test_got_eof() (python#149366)

The shutdown() behavior depends too much on the operating system and
it's unrelated to the got_eof_error change.

(cherry picked from commit 1e21cf6)

Author: vstinner

Lib/test/test_ssl.py

@@ -4820,14 +4820,6 @@ def test_got_eof(self):
                 sslsock.do_handshake()
 
             self.assertEqual(sslsock.pending(), 0)
-            try:
-                sslsock.shutdown(socket.SHUT_WR)
-            except OSError as exc:
-                self.assertEqual(exc.errno, errno.ENOTCONN)
-            else:
-                # On Windows and on OpenSSL 1.1.1, shutdown() doesn't
-                # raise an error
-                pass
 
 
 @unittest.skipUnless(has_tls_version('TLSv1_3') and ssl.HAS_PHA,