Update django-jsonfield requirement from <=1.0.1 to <1.2.1

Updates the requirements on [django-jsonfield](https://github.com/adamchainz/django-jsonfield) to permit the latest version.
- [Release notes](https://github.com/adamchainz/django-jsonfield/releases)
- [Commits](adamchainz/django-jsonfield@0.7...1.2.0)

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

requirements.txt

@@ -24,7 +24,7 @@ tqdm==4.31.1
 dj-pagination==2.4.0
 django-celery-monitor<=1.1.2
 django-filter==1.1.0
-django-jsonfield<=1.0.1
+django-jsonfield<1.2.1
 django-jsonfield-compat<=0.4.4
 django-leaflet==0.24.0
 django-taggit==0.24.0