[deps] Update django-leaflet requirement from ~=0.32.0 to ~=0.33.0

Updates the requirements on [django-leaflet](https://github.com/makinacorpus/django-leaflet) to permit the latest version.
- [Release notes](https://github.com/makinacorpus/django-leaflet/releases)
- [Changelog](https://github.com/makinacorpus/django-leaflet/blob/master/CHANGES)
- [Commits](https://github.com/makinacorpus/django-leaflet/compare/0.32.0...0.33.0)

---
updated-dependencies:
- dependency-name: django-leaflet
  dependency-version: 0.33.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>