New migration created in site-packages

[mezitax]

I am using a multi tenant app, and executing makemigrations generates a new migration in django-categories.

from django.db import migrations, models
import tenant_schemas.storage


class Migration(migrations.Migration):

    dependencies = [
        ('categories', '0004_auto_20200517_1832'),
    ]

    operations = [
        migrations.AlterField(
            model_name='category',
            name='level',
            field=models.PositiveIntegerField(db_index=True, editable=False),
        ),
        migrations.AlterField(
            model_name='category',
            name='lft',
            field=models.PositiveIntegerField(db_index=True, editable=False),
        ),
        migrations.AlterField(
            model_name='category',
            name='rght',
            field=models.PositiveIntegerField(db_index=True, editable=False),
        ),
        migrations.AlterField(
            model_name='category',
            name='thumbnail',
            field=models.FileField(blank=True, null=True, storage=tenant_schemas.storage.TenantFileSystemStorage(), upload_to='uploads/categories/thumbnails'),
        ),
    ]

*The last line is because I have in my settings.py:
DEFAULT_FILE_STORAGE = 'tenant_schemas.storage.TenantFileSystemStorage'

how to avoid new migrations?