feat: Add Python 3.9 support

[ycouce-cdd]

• Add version to Setuptools script.
• Add Tox environment.
• Add version to CI configuration.
• Update Docker Compose configuration.
• Update Make task for running tests: docker-compose-run-test.

More info: https://docs.python.org/3.9/whatsnew/3.9.html

Ref: https://cordada.aha.io/features/COMPCLDATA-162

[codecov-commenter]

Codecov Report

Base: 69.31% // Head: 69.31% // No change to project coverage 👍

Coverage data is based on head (a3d73ae) compared to base (89784d8).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #190   +/-   ##
========================================
  Coverage    69.31%   69.31%           
========================================
  Files            7        7           
  Lines          290      290           
  Branches        50       50           
========================================
  Hits           201      201           
  Misses          82       82           
  Partials         7        7           

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[jtrobles-cdd]

• Shouldn't the commit type be chore instead of feat?
• In the commit message, can you add an empty line before Ref: so that Git is able to recognize Ref: as a trailer?

[ycouce-cdd]

• Shouldn't the commit type be chore instead of feat?

Your call, I used as reference a PR in this repository (#13), which classified as feature these changes, according to the branch name.
If we now use new guidelines, I can change it, but the branch name would still be prefixed with feature.

[jtrobles-cdd]

• Shouldn't the commit type be chore instead of feat?

Your call, I used as reference a PR in this repository (#13), which classified as feature these changes, according to the branch name. If we now use new guidelines, I can change it, but the branch name would still be prefixed with feature.

Good point. I guess that adding support for a new Python version could be considered a feature.