Update djangorestframework requirement from ==3.14.* to ==3.15.* (#4001)

Updates the requirements on [djangorestframework](https://github.com/encode/django-rest-framework) to permit the latest version.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](https://github.com/encode/django-rest-framework/compare/3.14.0...3.15.0)

---
updated-dependencies:
- dependency-name: djangorestframework
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Raphael Michel <michel@rami.io>

pyproject.toml

@@ -55,7 +55,7 @@ dependencies = [
   "django-redis==5.4.*",
   "django-scopes==2.0.*",
   "django-statici18n==2.5.*",
-  "djangorestframework==3.14.*",
+  "djangorestframework==3.15.*",
   "dnspython==2.6.*",
   "drf_ujson2==1.7.*",
   "geoip2==4.*",