🎨(backend) removed unused imports

Please challenge this commit.
I feel these imports aren't used in this migration file.

src/backend/core/migrations/0001_initial.py

@@ -1,7 +1,5 @@
 # Generated by Django 5.0.3 on 2024-05-28 20:29
 
-import django.contrib.auth.models
-import django.core.validators
 import django.db.models.deletion
 import timezone_field.fields
 import uuid