add apparently required tzdata

poetry.lock

@@ -1075,7 +1075,7 @@ testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.8,<4.0"
-content-hash = "a87afc981c9ac45686bfddba0f8534be5770b53defe224f827f91141d8cf443e"
+content-hash = "017d766a83fcb9498aab3e8bec3ae1914957a311a80a0e1616b4d9c1602de96e"
 
 [metadata.files]
 amqp = [

pyproject.toml

@@ -29,6 +29,7 @@ django-celery-beat = {git="https://github.com/celery/django-celery-beat",rev="10
 redis = "^4.3"
 flower = "^1"
 django-extensions = "^3.1.3"
+tzdata = "^2022.1"
 
 [tool.poetry.dev-dependencies]
 pylint = "^2.3"