Add typing to operations in merge migration file

src/khoj/database/migrations/0081_merge_20250120_1633.py

@@ -1,5 +1,7 @@
 # Generated by Django 5.0.10 on 2025-01-20 16:33
 
+from typing import List
+
 from django.db import migrations
 
 
@@ -9,4 +11,4 @@ class Migration(migrations.Migration):
         ("database", "0080_speechtotextmodeloptions_ai_model_api"),
     ]
 
-    operations = []
+    operations: List[str] = []