Update to Python 3.13

[golles]

Proposed change

• Update to Python 3.13
• Pin Node 22 in dev container and also set that for CI
• Add VSCode task for pytest (and reorder json)

Breaking change

Checklist:

• I have performed a self-review of my code
• I have added tests that prove my fix is effective or that my feature works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (60cb7a0) to head (0aab9d5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #54   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           41        41           
  Lines         2253      2253           
=========================================
  Hits          2253      2253           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud