[2.7] closes bpo-32008: don't use PROTOCOL_TLSv1 in example (GH-5789) (#5792)

It's bad form to pin to an old version of TLS. ssl.SSLContext has the right
protocol default, so let's not pass anyway..
(cherry picked from commit e9edee0b65650c4f9db90cefc2e9a8125bad762c)
1 file changed