Use python3 for config/install-mod.py

[e-kwsm]

No description provided.

[codecov]

Codecov Report

Merging #118 (05465df) into main (1189af7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #118   +/-   ##
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  Coverage   59.16%   59.16%           
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  Files          40       40           
  Lines        2946     2946           
  Branches      995      995           
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  Hits         1743     1743           
  Misses        642      642           
  Partials      561      561           

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[awvwgk]

Are there still systems around where python is an alias for python2?

[e-kwsm]

Actually, python seems to be no longer available on Debian bullseye (next stable), which provides python3 and python2.
This leads to installation failure.