setup: Set the minimum required Python version to 3.10

[achimnol]

refs lablup/backend.ai#300

[codecov]

Codecov Report

Merging #123 (a2d0aa3) into main (6c031bb) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #123      +/-   ##
==========================================
+ Coverage   78.25%   78.30%   +0.05%     
==========================================
  Files          24       24              
  Lines        3251     3268      +17     
==========================================
+ Hits         2544     2559      +15     
- Misses        707      709       +2     

Impacted Files	Coverage Δ
src/ai/backend/common/argparse.py	100.00% <ø> (ø)
src/ai/backend/common/etcd.py	83.01% <ø> (+0.22%)	⬆️
src/ai/backend/common/validators.py	70.30% <ø> (-0.26%)	⬇️
src/ai/backend/common/events.py	85.98% <0.00%> (-0.47%)	⬇️
src/ai/backend/common/files.py	95.12% <0.00%> (+0.12%)	⬆️
src/ai/backend/common/logging.py	61.92% <0.00%> (+0.14%)	⬆️
src/ai/backend/common/redis.py	77.61% <0.00%> (+0.27%)	⬆️
src/ai/backend/common/plugin/__init__.py	91.11% <0.00%> (+0.30%)	⬆️
... and 2 more

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