python 3.10 cutover (SYN-3525)

[vEpiphyte]

• mark 3.10 as a supported python version
• build images off of debian with 3.10
• lighten 3.7 builds in from circleci
• add 3.10 to circleci

[codecov]

Codecov Report

Base: 97.21% // Head: 97.11% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (2fe1e04) compared to base (fc6fbe3).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2962      +/-   ##
==========================================
- Coverage   97.21%   97.11%   -0.11%     
==========================================
  Files         218      218              
  Lines       43203    43203              
==========================================
- Hits        42001    41956      -45     
- Misses       1202     1247      +45     

Flag	Coverage Δ
linux	97.11% <ø> (ø)
linux_replay	?

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

Impacted Files	Coverage Δ
synapse/__init__.py	62.50% <ø> (ø)
synapse/tests/utils.py	94.46% <0.00%> (-1.89%)	⬇️
synapse/cortex.py	96.68% <0.00%> (-0.55%)	⬇️
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	97.01% <0.00%> (-0.34%)	⬇️
synapse/lib/jsonstor.py	98.32% <0.00%> (-0.24%)	⬇️
synapse/axon.py	98.73% <0.00%> (-0.15%)	⬇️
synapse/lib/layer.py	96.99% <0.00%> (-0.05%)	⬇️

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