Handle exception on migration (#7322)

* Handle exception on migration

* Make migration non-atomic

src/backend/InvenTree/users/migrations/0011_auto_20240523_1640.py

@@ -9,12 +9,17 @@ from django.db import migrations
 def clear_sessions(apps, schema_editor):
     """Clear all user sessions."""
 
+    try:
         engine = import_module(settings.SESSION_ENGINE)
         engine.SessionStore.clear_expired()
         print('Cleared all user sessions to deal with GHSA-2crp-q9pc-457j')
-
+    except Exception:
+        # Database may not be ready yet, so this does not matter anyhow
+        pass
 class Migration(migrations.Migration):
 
+    atomic = False
+
     dependencies = [
         ("users", "0010_alter_apitoken_key"),
     ]