Apply lint and format for Python 3.9

[Viicos]

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@@            Coverage Diff             @@
##             main     #515      +/-   ##
==========================================
- Coverage   96.27%   96.11%   -0.17%     
==========================================
  Files          11       11              
  Lines        1074     1081       +7     
  Branches      209      144      -65     
==========================================
+ Hits         1034     1039       +5     
- Misses         19       21       +2     
  Partials       21       21              

Files with missing lines	Coverage Δ
arq/connections.py	87.42% <100.00%> (-2.65%)	⬇️
arq/jobs.py	98.15% <100.00%> (ø)
arq/logs.py	100.00% <100.00%> (ø)
arq/typing.py	100.00% <100.00%> (+9.52%)	⬆️
arq/utils.py	100.00% <100.00%> (ø)
arq/worker.py	97.37% <100.00%> (+0.20%)	⬆️

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