Bump django from 3.2.10 to 3.2.15

Bumps [django](https://github.com/django/django) from 3.2.10 to 3.2.15.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@3.2.10...3.2.15)

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

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

requirements.txt

@@ -19,7 +19,7 @@ django-debug-toolbar==3.2.3; python_version >= "3.6"
 django-environ==0.4.5
 django-split-settings==1.1.0; python_version >= "3.6" and python_version < "4.0"
 django-watchman==1.2.0
-django==3.2.10; python_version >= "3.6"
+django==3.2.15; python_version >= "3.6"
 djangorestframework==3.13.0; python_version >= "3.6"
 docutils==0.16; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
 dulwich==0.19.16