Bump celery in /{{ cookiecutter.project_name }}/app/requirements

Bumps [celery](https://github.com/celery/celery) from 5.1.1 to 5.1.2.
- [Release notes](https://github.com/celery/celery/releases)
- [Changelog](https://github.com/celery/celery/blob/master/Changelog.rst)
- [Commits](celery/celery@v5.1.1...v5.1.2)

---
updated-dependencies:
- dependency-name: celery
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

{{ cookiecutter.project_name }}/app/requirements/production.txt

@@ -3,5 +3,5 @@ django-celery-beat==2.2.0
 psycopg2-binary==2.9.1
 redis==3.5.3
 kombu==5.1.0
-celery==5.1.1
+celery==5.1.2
 gunicorn==20.1.0