Python2 is not supported anymore, removing artifact

[ewjoachim]

No ticket

Successful PR Checklist:

• Tests
• Documentation (optionally: run spell checking)
• Had a good time contributing? (feel free to give some feedback)

[samuelhamard]

🚀

[codecov]

Codecov Report

Merging #38 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage   88.98%   88.96%   -0.02%     
==========================================
  Files          13       13              
  Lines         581      580       -1     
  Branches       72       72              
==========================================
- Hits          517      516       -1     
  Misses         49       49              
  Partials       15       15

Flag	Coverage Δ
#integration	81.2% <100%> (-0.04%)	⬇️
#unit	56.55% <100%> (-0.08%)	⬇️

Impacted Files	Coverage Δ
septentrion/runner.py	94.89% <100%> (-0.06%)	⬇️

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