[deps] Update djangorestframework requirement

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](encode/django-rest-framework@3.12.0...3.15.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

setup.py

@@ -25,7 +25,7 @@
     platforms=['Platform Indipendent'],
     keywords=['django', 'rest-framework', 'gis', 'geojson'],
     packages=find_packages(exclude=['tests', 'tests.*']),
-    install_requires=['djangorestframework>=3.12,<3.15', 'django-filter>=23.5,<25.0'],
+    install_requires=['djangorestframework>=3.12,<3.16', 'django-filter>=23.5,<25.0'],
     classifiers=[
         'Development Status :: 4 - Beta',
         'Environment :: Web Environment',