Bump gunicorn from 23.0.0 to 26.0.0

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 23.0.0 to 26.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@23.0.0...26.0.0)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-version: 26.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Pipfile

@@ -4,7 +4,7 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-gunicorn = "==23.0.0"
+gunicorn = "==26.0.0"
 celery = { extras = ["redis"], version = "==5.5.3" }
 django-tinymce = "==4.1.0"
 whitenoise = "==6.9.0"