feat: Upgrade Python to 3.8

[cewei8483]

Description

How Has This Been Tested?

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have linked this PR to a ZenHub Issue.

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This change is 

[codecov[bot]]

Codecov Report

Merging #1778 (3f0bf65) into master (d92982e) will increase coverage by 0.70%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1778      +/-   ##
==========================================
+ Coverage   66.73%   67.44%   +0.70%     
==========================================
  Files         178      183       +5     
  Lines        3638     3772     +134     
  Branches      250      264      +14     
==========================================
+ Hits         2428     2544     +116     
- Misses       1184     1200      +16     
- Partials       26       28       +2     

see 23 files with indirect coverage changes