Bump djangorestframework from 3.11.0 to 3.11.2

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.11.0 to 3.11.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](https://github.com/encode/django-rest-framework/compare/3.11.0...3.11.2)

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

requirements.txt

@@ -1,7 +1,7 @@
 asgiref==3.2.3
 -e git+https://github.com/DataDog/dd-trace-py@7a45ee7229b3ffeaa06c3818289afeec9cb00034#egg=ddtrace
 Django==3.0.1
-djangorestframework==3.11.0
+djangorestframework==3.11.2
 psutil==5.6.7
 pytz==2019.3
 sqlparse==0.3.0