fix: Multiple provider_urls not working with iam-assumable-role-with-oidc

[yukin01]

Description

fix #114

Motivation and Context

See #114

Breaking Changes

No breaking changes

How Has This Been Tested?

This PR was tested by extending the example provided with the module (examples/iam-assumable-role-with-oidc).
Also see expected output in #114

Terraform plan output

  # module.iam_assumable_role_admin.aws_iam_role.this[0] will be created
  + resource "aws_iam_role" "this" {
      + arn                   = (known after apply)
      + assume_role_policy    = jsonencode(
            {
              + Statement = [
                  + {
                      + Action    = "sts:AssumeRoleWithWebIdentity"
                      + Condition = {
                          + StringEquals = {
                              + oidc.eks.eu-west-1.amazonaws.com/id/AA9E170D464AF7B92084EF72A69B9DC8:sub = [
                                  + "system:serviceaccount:default:sa2",
                                  + "system:serviceaccount:default:sa1",
                                ]
                            }
                        }
                      + Effect    = "Allow"
                      + Principal = {
                          + Federated = "arn:aws:iam::530488130478:oidc-provider/oidc.eks.eu-west-1.amazonaws.com/id/AA9E170D464AF7B92084EF72A69B9DC8"
                        }
                      + Sid       = ""
                    },
                  + {
                      + Action    = "sts:AssumeRoleWithWebIdentity"
                      + Condition = {
                          + StringEquals = {
                              + oidc.eks.eu-west-1.amazonaws.com/id/BA9E170D464AF7B92084EF72A69B9DC8:sub = [
                                  + "system:serviceaccount:default:sa2",
                                  + "system:serviceaccount:default:sa1",
                                ]
                            }
                        }
                      + Effect    = "Allow"
                      + Principal = {
                          + Federated = "arn:aws:iam::530488130478:oidc-provider/oidc.eks.eu-west-1.amazonaws.com/id/BA9E170D464AF7B92084EF72A69B9DC8"
                        }
                      + Sid       = ""
                    },
                ]
              + Version   = "2012-10-17"
            }
        )
      + create_date           = (known after apply)
      + force_detach_policies = false
      + id                    = (known after apply)
      + max_session_duration  = 3600
      + name                  = "role-with-oidc"
      + path                  = "/"
      + tags                  = {
          + "Role" = "role-with-oidc"
        }
      + unique_id             = (known after apply)
    }

[chancez]

Whoops I guess i missed this when implementing it. Good catch.

[yukin01]

@antonbabenko
Now that I have resolved the conflicts, could you please review it again?

[antonbabenko]

Thanks, @yukin01 !

v3.7.0 has been just released.

[github-actions]

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