Update celery from 5.3.6 to 5.4.0

{{cookiecutter.project_slug}}/requirements/base.txt

@@ -16,7 +16,7 @@ redis==5.0.3  # https://github.com/redis/redis-py
 hiredis==2.3.2  # https://github.com/redis/hiredis-py
 {%- endif %}
 {%- if cookiecutter.use_celery == "y" %}
-celery==5.3.6  # pyup: < 6.0  # https://github.com/celery/celery
+celery==5.4.0  # pyup: < 6.0  # https://github.com/celery/celery
 django-celery-beat==2.6.0  # https://github.com/celery/django-celery-beat
 {%- if cookiecutter.use_docker == 'y' %}
 flower==2.0.1  # https://github.com/mher/flower