update python version in docker to see what breaks

[htwangtw]

Closes #75

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.05%. Comparing base (e44fca6) to head (34b1cc2).
Report is 54 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #154   +/-   ##
=======================================
  Coverage   94.05%   94.05%           
=======================================
  Files          18       18           
  Lines         757      757           
=======================================
  Hits          712      712           
  Misses         45       45           

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