Bump django-csp-reports from 1.3 to 1.4

Bumps [django-csp-reports](https://github.com/adamalton/django-csp-reports) from 1.3 to 1.4.
- [Release notes](https://github.com/adamalton/django-csp-reports/releases)
- [Commits](https://github.com/adamalton/django-csp-reports/commits)

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

requirements/base.txt

@@ -3,7 +3,7 @@ django-bootstrap3==12.0.3
 dj-database-url==0.5.0
 dj-static==0.0.6
 django-csp==3.6
-django-csp-reports==1.3
+django-csp-reports==1.4
 django-crispy-forms==1.9.0
 django-filter==2.2.0
 djangorestframework==3.11.0