security/py-cryptography: Update to 2.3
This version update fixes builds with libressl >= 2.7.
Builds with openssl-devel are broken due to an underlying lang/python* port
issue [1].
Changelog:
https://github.com/pyca/cryptography/blob/2.3/CHANGELOG.rst
[1] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229223
PR: 226906
Submitted by: Charli Li <ml+freebsd vishwin info>
Reported by: many
MFH: 2018Q3 (fixes package build, security fix)
Security: 9e2d0dcf-9926-11e8-a92d-0050562a4d7b