Upgrade project dependencies

[Dresdn]

• Update Python version support to 3.8, 3.9, 3.10, 3.11, 3.12
• Update Django version support to 4.2, 5.0
• Upgrade to:
  • Poetry 1.8.2
  • PostgreSQL 16
  • django-tenants 3.6
  • mypy 1.10.0
  • django-stubs 5.0.0
• Drop support for:
  • Python 3.7
  • Django 3.2, 4.0, 4.1

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.36%. Comparing base (2b2c385) to head (0a82aa4).
Report is 32 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #567   +/-   ##
=======================================
  Coverage   88.36%   88.36%           
=======================================
  Files          18       18           
  Lines         619      619           
  Branches      116      116           
=======================================
  Hits          547      547           
  Misses         62       62           
  Partials       10       10           

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