[deps] Update django-pipeline requirement from ~=3.1.0 to ~=4.0.0

Updates the requirements on [django-pipeline](https://github.com/jazzband/django-pipeline) to permit the latest version.
- [Release notes](https://github.com/jazzband/django-pipeline/releases)
- [Changelog](https://github.com/jazzband/django-pipeline/blob/master/HISTORY.rst)
- [Commits](jazzband/django-pipeline@3.1.0...4.0.0)

---
updated-dependencies:
- dependency-name: django-pipeline
  dependency-version: 4.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

files/requirements.txt

@@ -1,4 +1,4 @@
 channels_redis~=4.2.0
 django-redis~=6.0.0
-django-pipeline~=3.1.0
+django-pipeline~=4.0.0
 uwsgi~=2.0.30