Align Heroku deployment snapshot with supported Gunicorn version

[Copilot]

Heroku startup was failing because the deployment snapshot depended on an outdated Gunicorn path that breaks on newer environments with ModuleNotFoundError: No module named 'pkg_resources'. This updates the affected deployment snapshot to install a current Gunicorn release that matches the repo’s later deployment stages.

• Dependency update

  • Added gunicorn==23.0.0 to the Heroku deployment snapshot at 18-deployment/18-03-connect-your-db-to-your-local-development-web-server/requirements.txt
  • Brings the first Heroku-oriented snapshot in line with the newer deployment snapshots already using the same version

• Deployment consistency

  • Keeps the snapshot’s Procfile-based startup path backed by an explicit Gunicorn dependency
  • Avoids drift between the early Heroku deployment stage and the later, already-correct deployment examples

django-crispy-forms==1.14.0
gunicorn==23.0.0
idna==3.10