Update pyopenssl and cryptography

[bensteinberg]

https://www.pyopenssl.org/en/latest/changelog.html

https://cryptography.io/en/latest/changelog/

I thought pytest-django-liveserver-ssl was keeping us from upgrading cryptography, but when I examined the situation, it doesn't pin it or pyopenssl: I was able to bump the latter, then the former.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.22%. Comparing base (0d09be0) to head (34b9479).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3481   +/-   ##
========================================
  Coverage    71.22%   71.22%           
========================================
  Files           48       48           
  Lines         6512     6512           
========================================
  Hits          4638     4638           
  Misses        1874     1874           

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