ci: make sure that jobs are running with a proper python version

[marcosschroh]

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[github-actions]

PR Preview Action v1.6.0
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.41%. Comparing base (d6b2a51) to head (a9d7ced).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #301      +/-   ##
==========================================
+ Coverage   96.00%   96.41%   +0.40%     
==========================================
  Files          24       24              
  Lines         977      977              
==========================================
+ Hits          938      942       +4     
+ Misses         39       35       -4     

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