Update pyopenssl and cryptography requirements (SYN-4913)

[vEpiphyte]

Blocks the following updates:

vertexproject/vtx-base-image#282
vertexproject/vtx-base-image#296

[codecov]

Codecov Report

Base: 97.20% // Head: 97.09% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (908757a) compared to base (e382d82).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3022      +/-   ##
==========================================
- Coverage   97.20%   97.09%   -0.11%     
==========================================
  Files         220      220              
  Lines       43536    43535       -1     
==========================================
- Hits        42317    42271      -46     
- Misses       1219     1264      +45     

Flag	Coverage Δ
linux	97.09% <100.00%> (-0.01%)	⬇️
linux_replay	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
synapse/lib/certdir.py	97.94% <100.00%> (-0.01%)	⬇️
synapse/tests/utils.py	94.49% <0.00%> (-1.88%)	⬇️
synapse/cortex.py	96.72% <0.00%> (-0.56%)	⬇️
synapse/lib/hiveauth.py	96.01% <0.00%> (-0.48%)	⬇️
synapse/lib/oauth.py	98.68% <0.00%> (-0.44%)	⬇️
synapse/lib/trigger.py	95.01% <0.00%> (-0.39%)	⬇️
synapse/lib/view.py	97.02% <0.00%> (-0.34%)	⬇️
synapse/lib/jsonstor.py	98.32% <0.00%> (-0.24%)	⬇️
synapse/axon.py	98.47% <0.00%> (-0.14%)	⬇️
synapse/lib/layer.py	96.60% <0.00%> (-0.04%)	⬇️

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