chore: avoid implicit optional in type annotations of method (#8727)

api/services/tools/tools_transform_service.py

@@ -144,7 +144,7 @@ class ToolTransformService:
 
     @staticmethod
     def workflow_provider_to_user_provider(
-        provider_controller: WorkflowToolProviderController, labels: list[str] = None
+        provider_controller: WorkflowToolProviderController, labels: Optional[list[str]] = None
     ):
         """
         convert provider controller to user provider
@@ -174,7 +174,7 @@ class ToolTransformService:
         provider_controller: ApiToolProviderController,
         db_provider: ApiToolProvider,
         decrypt_credentials: bool = True,
-        labels: list[str] = None,
+        labels: Optional[list[str]] = None,
     ) -> UserToolProvider:
         """
         convert provider controller to user provider
@@ -223,9 +223,9 @@ class ToolTransformService:
     @staticmethod
     def tool_to_user_tool(
         tool: Union[ApiToolBundle, WorkflowTool, Tool],
-        credentials: dict = None,
-        tenant_id: str = None,
-        labels: list[str] = None,
+        credentials: Optional[dict] = None,
+        tenant_id: Optional[str] = None,
+        labels: Optional[list[str]] = None,
     ) -> UserTool:
         """
         convert tool to user tool