chore:Remove deprecated pytz usage and setup Django in Celery.

This commit removes the USE_DEPRECATED_PYTZ setting from local.py as it is no longer necessary. Additionally, it ensures Django is properly set up in the Celery configuration, which may prevent potential issues with accessing Django models or settings within Celery tasks.

fbr/config/celery.py

@@ -4,7 +4,10 @@
 from celery.schedules import crontab
 from dbt_copilot_python.celery_health_check import healthcheck
 
+import django
+
 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings.local")
+django.setup()
 
 celery_app = Celery("fbr_celery")
 

fbr/config/settings/local.py

@@ -9,6 +9,4 @@
     "cache",
 ]
 
-USE_DEPRECATED_PYTZ = True
-
 INSTALLED_APPS = BASE_APPS + INSTALLED_APPS  # noqa