EKS: Fix deprecation warning for aws_subnet_ids

[mark5cinco]

Summary

Fixes deprecation warning on aws_subnet_ids. Change to aws_subnets

Example

Warning: Deprecated Resource

  with module.my_app.data.aws_subnet_ids.current,
  on .terraform/modules/eks_apne1_one_node_pool_machine_learning/aws/cluster/node-pool/data_sources.tf line 16, in data "aws_subnet_ids" "current":
  16: data "aws_subnet_ids" "current" {

The aws_subnet_ids data source has been deprecated and will be removed in a
future version. Use the aws_subnets data source instead.