Disable the use of session tickets on TLSv1.2 by default
Disable the use of session tickets on TLSv1.2 by default

Since currently session resumption is not supported by urllib3
there is no reason to request tickets from the server.
It takes up extra bytes in transit (~200 bytes), and raises some
minor security concerns.

See: https://blog.filippo.io/we-need-to-talk-about-session-tickets
sigmavirus24/urllib3,urllib3/urllib3,sigmavirus24/urllib3,urllib3/urllib3