Bump django-pipeline from 2.1.0 to 3.1.0

Bumps [django-pipeline](https://github.com/jazzband/django-pipeline) from 2.1.0 to 3.1.0.
- [Release notes](https://github.com/jazzband/django-pipeline/releases)
- [Changelog](https://github.com/jazzband/django-pipeline/blob/master/HISTORY.rst)
- [Commits](jazzband/django-pipeline@2.1.0...3.1.0)

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

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

requirements/base.txt

@@ -23,7 +23,7 @@ django-dotenv==1.4.2
 django-extensions==3.2.1
 django-filter==23.1
 django-model-utils==4.3.1
-django-pipeline==2.1.0
+django-pipeline==3.1.0
 django-storages==1.13.2
 django-svelte==0.2.1
 django-webtest==1.9.10