chore: replace pseudo-random generators with secrets module (#20616)

api/core/helper/moderation.py

@@ -1,5 +1,5 @@
 import logging
-import random
+import secrets
 from typing import cast
 
 from core.app.entities.app_invoke_entities import ModelConfigWithCredentialsEntity
@@ -38,7 +38,7 @@ def check_moderation(tenant_id: str, model_config: ModelConfigWithCredentialsEnt
             if len(text_chunks) == 0:
                 return True
 
-            text_chunk = random.choice(text_chunks)
+            text_chunk = secrets.choice(text_chunks)
 
             try:
                 model_provider_factory = ModelProviderFactory(tenant_id)