[CHANGE] Move build process to PEP 621

[ppfeufer]

Description

Changed

• Move the build process to PEP 621

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality not to work as expected)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented on my code, particularly in hard-to-understand areas
• [x] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

Merging #261 (285e005) into development (144a067) will increase coverage by 0.26%. The diff coverage is 32.69%.

:exclamation: Current head 285e005 differs from pull request most recent head a73689e. Consider uploading reports for the commit a73689e to get more accurate results

@@               Coverage Diff               @@
##           development     #261      +/-   ##
===============================================
+ Coverage        68.25%   68.51%   +0.26%     
===============================================
  Files               24       24              
  Lines             1241     1245       +4     
  Branches           155      151       -4     
===============================================
+ Hits               847      853       +6     
+ Misses             374      372       -2     
  Partials            20       20              

Impacted Files	Coverage Δ
afat/tasks.py	35.41% <16.66%> (-1.22%)	:arrow_down:
afat/__init__.py	100.00% <100.00%> (ø)
afat/models.py	92.17% <100.00%> (+0.50%)	:arrow_up:

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