feat: Add ec2:DescribeSubnets policy to aws-vpc-cni (#29)

Co-authored-by: Shaun Becker <shaun.becker@greenhouse.io>

Author: shaunofneuron

aws_vpc_cni.tf

@@ -43,6 +43,7 @@ data "aws_iam_policy_document" "vpc_cni" {
         "ec2:DescribeTags",
         "ec2:DescribeNetworkInterfaces",
         "ec2:DescribeInstanceTypes",
+        "ec2:DescribeSubnets",
         "ec2:DetachNetworkInterface",
         "ec2:ModifyNetworkInterfaceAttribute",
         "ec2:UnassignPrivateIpAddresses",