Bump djangorestframework in /dsmrreader/provisioning/requirements

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.14.0 to 3.15.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.14.0...3.15.2)

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

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

dsmrreader/provisioning/requirements/base.txt

@@ -10,7 +10,7 @@ django-filter==21.1
 django-mathfilters==1.0.0
 django-solo==2.1.0
 django==3.2.23
-djangorestframework==3.14.0
+djangorestframework==3.15.2
 dropbox==11.36.2
 gunicorn==20.1.0
 influxdb-client==1.39.0