How can i update the EKS default security group with my custom change using terraform

Check out this documentation to learn more about the default security group rules in EKS

https://docs.aws.amazon.com/eks/latest/userguide/sec-group-reqs.html

From the docs:

If you need to limit the open ports between the cluster and nodes, you can remove the default outbound rule and add the following minimum rules that are required for the cluster. If you remove the default inbound rule, Amazon EKS recreates it whenever the cluster is updated.