Update poetry.lock (black, django, and 6 more)

- `poetry.lock` was updated (including 8 direct and 28 transitive dependencies)
  - `black` was updated from 23.7.0 to 23.12.1
  - `django` was updated from 4.2.4 to 4.2.14
  - `isort` was updated from 5.12.0 to 5.13.2
  - `mypy` was updated from 1.4.1 to 1.11.1
  - `pytest` was updated from 7.4.0 to 7.4.4
  - `pytest-django` was updated from 4.5.2 to 4.8.0
  - `python-dotenv` was updated from 1.0.0 to 1.0.1
  - `requests` was updated from 2.31.0 to 2.32.3

Author: dependencies-bot