[3.7] bpo-41561: Add workaround for Ubuntu's custom security level (GH-24915) (GH-24928)

Ubuntu 20.04 comes with a patched OpenSSL 1.1.1. Default security level
2 blocks TLS 1.0 and 1.1 connections. Regular OpenSSL 1.1.1 builds allow
TLS 1.0 and 1.1 on security level 2.

See:
See: https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1899878
See: https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1917625
Signed-off-by: Christian Heimes <christian@python.org>.
(cherry picked from commit f6c6b5821bff815bdc810de53992fd1fbdb2edd4)

Co-authored-by: Christian Heimes <christian@python.org>