chore(deps): update dependency django-celery-beat to v2.9.0

Author: renovate[bot]

requirements.txt

@@ -14,7 +14,7 @@ cryptography==46.0.5
 Django==5.2.11
 django-appconf==1.2.0
 django-auth-ldap==5.3.0
-django-celery-beat==2.8.1
+django-celery-beat==2.9.0
 django-cors-headers==4.9.0
 django-crispy-forms==2.5
 django-otp==1.7.0