Update ecs-fargate-task-definition to solve bug that prevents passing ARN references

[jsubirat]

This PR updates the ecs-fargate-task-definition version in order to include this fix: cn-terraform/terraform-aws-ecs-fargate-task-definition#30. The fix was introduced in 1.0.30, but I chose to update to the latest patch version. Specifically, this will allow us to pass task custom policies like this:

resource "aws_secretsmanager_secret" "foo" {
  name = "bar"
}

...

task_custom_policies = [
    jsonencode(
      {
        "Version" : "2012-10-17",
        "Statement" : [
          {
            "Effect" : "Allow",
            "Action" : [
              "secretsmanager:GetSecretValue"
            ],
            "Resource" : [
              aws_secretsmanager_secret.foo.arn
            ]
          }
        ]
      }
    )

[rogercoll]

LGTM