[deps] Update jsonfield requirement from ~=3.1.0 to ~=3.2.0

Updates the requirements on [jsonfield](https://github.com/rpkilby/jsonfield) to permit the latest version.
- [Release notes](https://github.com/rpkilby/jsonfield/releases)
- [Changelog](https://github.com/rpkilby/jsonfield/blob/master/CHANGES.rst)
- [Commits](rpkilby/jsonfield@3.1.0...3.2.0)

---
updated-dependencies:
- dependency-name: jsonfield
  dependency-version: 3.2.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 openwisp-users @ https://github.com/openwisp/openwisp-users/archive/refs/heads/1.3.tar.gz
 netdiff~=1.2.0
-jsonfield~=3.1.0
+jsonfield~=3.2.0
 django-flat-json-widget @ https://github.com/openwisp/django-flat-json-widget/archive/refs/heads/0.5.tar.gz
 openwisp-utils[celery,channels] @ https://github.com/openwisp/openwisp-utils/archive/refs/heads/1.3.tar.gz