fix: Policy generation when ebs_csi_kms_cmk_ids is set

[schantaraud]

Description

Fixed a typo causing plan/apply to fail when ebs_csi_kms_cmk_ids is set in the "terraform-aws-modules/iam/aws//modules/iam-role-for-service-accounts-eks" module.

Motivation and Context

Without this change, setting ebs_csi_kms_cmk_ids results in the following error (statement.value is 1 instead of the list of CMK ARNs):

╷
│ Error: Incorrect attribute value type
│ 
│   on .terraform/modules/[redacted].aws_ebs_csi_driver_irsa/modules/iam-role-for-service-accounts-eks/policies.tf line 259, in data "aws_iam_policy_document" "ebs_csi":
│  259:       resources = statement.value
│ 
│ Inappropriate value for attribute "resources": set of string required.
╵
╷
│ Error: Incorrect attribute value type
│ 
│   on .terraform/modules/[redacted].aws_ebs_csi_driver_irsa/modules/iam-role-for-service-accounts-eks/policies.tf line 281, in data "aws_iam_policy_document" "ebs_csi":
│  281:       resources = statement.value
│ 
│ Inappropriate value for attribute "resources": set of string required.

Breaking Changes

None

How Has This Been Tested?

• I have tested and validated these changes using one or more of the provided examples/* projects
  Tested, with and without setting ebs_csi_kms_cmk_ids, as well as with 0, 1 and multiple values.

[bryantbiggs]

thanks for the PR @schantaraud - we should update the example to include ebs_csi_kms_cmk_ids so that we can validate this change and avoid any regressions going forward

[thuandt]

Tested with my cluster <3 Thanks @schantaraud

[bryantbiggs]

Closes #211

[bryantbiggs]

@antonbabenko good to go - I can catch up the example later for this

[antonbabenko]

This PR is included in version 4.15.0 🎉

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