Using the latest version of TLS can help keep data in-transit protected from man-in-the-middle and similar attacks.
In Azure Console -
In Terraform -
References:
https://learn.microsoft.com/en-us/azure/api-management/api-management-howto-manage-protocols-ciphers
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/api_management#security