setup,ci: Set the required Python version to 3.10

[achimnol]

refs lablup/backend.ai#300

[codecov]

Codecov Report

Merging #550 (f73c222) into main (ae3b424) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #550   +/-   ##
=======================================
  Coverage   49.06%   49.07%           
=======================================
  Files          55       55           
  Lines        9155     9166   +11     
=======================================
+ Hits         4492     4498    +6     
- Misses       4663     4668    +5     

Impacted Files	Coverage Δ
src/ai/backend/manager/plugin/__init__.py	84.44% <0.00%> (-0.62%)	⬇️
src/ai/backend/manager/api/events.py	35.63% <0.00%> (-0.28%)	⬇️
src/ai/backend/manager/models/base.py	53.54% <0.00%> (-0.27%)	⬇️
src/ai/backend/manager/api/utils.py	52.00% <0.00%> (-0.24%)	⬇️
src/ai/backend/manager/api/auth.py	47.79% <0.00%> (-0.13%)	⬇️
src/ai/backend/manager/config.py	44.20% <0.00%> (+0.17%)	⬆️
src/ai/backend/manager/distributed.py	93.54% <0.00%> (+0.21%)	⬆️
src/ai/backend/manager/server.py	62.10% <0.00%> (+0.52%)	⬆️

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