Update django-recaptcha requirement from ~=3.0.0 to ~=4.0.0

Updates the requirements on [django-recaptcha](https://github.com/torchbox/django-recaptcha) to permit the latest version.
- [Release notes](https://github.com/torchbox/django-recaptcha/releases)
- [Changelog](https://github.com/torchbox/django-recaptcha/blob/main/CHANGELOG.md)
- [Commits](django-recaptcha/django-recaptcha@3.0.0...4.0.0)

---
updated-dependencies:
- dependency-name: django-recaptcha
  dependency-type: direct:production
...

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

requirements.txt

@@ -10,7 +10,7 @@ crispy-bootstrap5==0.7
 # we might need to think about migrating away from this completely
 django-bootstrap-breadcrumbs2==1.0.0
 django-formtools~=2.4
-django-recaptcha~=3.0.0
+django-recaptcha~=4.0.0
 Django==4.2.6
 django-activity-stream==2.0.0
 django-axes==6.1.1