Merge branch '542-problems-with-current-version-of-celery-5-2-0' into 'master'

Resolve "Problems with current version of Celery (5.2.0)"

Closes #542

See merge request !849

pyproject.toml

@@ -74,7 +74,7 @@ html2text = "^2020.0.0"
 django-ckeditor = "^6.0.0"
 django-js-reverse = "^0.9.1"
 calendarweek = "^0.5.0"
-Celery = {version=">=5.0,<5.2", extras=["django", "redis"]}
+Celery = {version="^5.2", extras=["django", "redis"]}
 django-celery-results = "^2.0.1"
 django-celery-beat = "^2.2.0"
 django-celery-email = "^3.0.0"
@@ -86,7 +86,7 @@ django-guardian = "^2.2.0"
 rules = "^3.0"
 django-cache-memoize = "^0.1.6"
 django-haystack = "^3.1"
-celery-haystack-ng = "^0.20"
+celery-haystack-ng = "^0.21.1"
 django-dbbackup = "^3.3.0"
 spdx-license-list = "^0.5.0"
 license-expression = "^21.6"