Bump django from 3.2.25 to 5.1.1 in /requirements

Bumps [django](https://github.com/django/django) from 3.2.25 to 5.1.1.
- [Commits](django/django@3.2.25...5.1.1)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements/main.txt

@@ -1,6 +1,6 @@
 channels[daphne]==4.0.0
 diskcache==5.6.3
-django==3.2.25
+django==5.1.1
 django-cleanup==8.1.0
 django-compression-middleware==0.5.0
 django-compressor==4.4