Py38 feature prep

[vEpiphyte]

• Update core requirements to 3.8 compatible versions.
• Cut py38 wheels
• Move docker images over to using python 3.8

[codecov]

Codecov Report

Merging #1921 into master will decrease coverage by 0.25%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1921      +/-   ##
==========================================
- Coverage   96.71%   96.46%   -0.26%     
==========================================
  Files         139      139              
  Lines       26535    26535              
==========================================
- Hits        25664    25597      -67     
- Misses        871      938      +67     

Flag	Coverage Δ
#linux	96.46% <ø> (-0.26%)	⬇️
#linux_replay	?

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

Impacted Files	Coverage Δ
synapse/lib/spawn.py	89.10% <0.00%> (-8.34%)	⬇️
synapse/tests/utils.py	93.56% <0.00%> (-2.20%)	⬇️
synapse/cortex.py	95.21% <0.00%> (-0.82%)	⬇️
synapse/lib/hiveauth.py	95.96% <0.00%> (-0.77%)	⬇️
synapse/lib/view.py	95.29% <0.00%> (-0.75%)	⬇️
synapse/lib/trigger.py	93.91% <0.00%> (-0.44%)	⬇️
synapse/common.py	97.16% <0.00%> (-0.32%)	⬇️
synapse/lib/layer.py	97.80% <0.00%> (-0.07%)	⬇️

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[vEpiphyte]

py38

[vEpiphyte]

replays