Using the latest version of TLS can help keep data in-transit protected from man-in-the-middle and similar attacks.
In GCP Console -
In Terraform -
References:
https://cloud.google.com/load-balancing/docs/use-ssl-policies
https://registry.terraform.io/providers/hashicorp/google/4.50.0/docs/resources/compute_region_policy#min_tls_version