fix: remove empty string elements from local.urls in iam-assumable-role-with-oidc submodule

[yukin01]

Description

Remove empty string elements from local.urls in iam-assumable-role-with-oidc submodule.

Motivation and Context

If only var.provider_urls is specified and var.provider_url is not specified, the array will contain an empty character and an error will occur.

Breaking Changes

No.

How Has This Been Tested?

Execute terraform plan as follows.

module "iam_assumable_role_admin" {
  source  = "terraform-aws-modules/iam/aws//modules/iam-assumable-role-with-oidc"
  version = "2.22.0"

  create_role   = true
  role_name     = "role-with-oidc"
  provider_urls = ["oidc.eks.eu-west-1.amazonaws.com/id/AA9E170D464AF7B92084EF72A69B9DC8"]
  role_policy_arns = [
    "arn:aws:iam::aws:policy/AmazonEKS_CNI_Policy",
  ]
  oidc_fully_qualified_subjects = ["system:serviceaccount:default:sa1", "system:serviceaccount:default:sa2"]
}

[antonbabenko]

Good catch, @yukin01 !

v2.25.0 has been just released.

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