Unauthorized error when using API key for Kibana alerting

[dimuon]

Describe the bug

Kibana alerting client fails to authorize using api key with the error

***"statusCode":401,"error":"Unauthorized","message":"Unauthorized"***

Looks like the issue is introduced by the regenerating Kibana OpenAPI specs from https://raw.githubusercontent.com/elastic/kibana/8.7/x-pack/plugins/alerting/docs/openapi/bundled.json.

Also, looks like the acc tests don't use API key authoz for Kibana alerting.

To Reproduce
Steps to reproduce the behavior:

1. Use Kibana alerting with API key authorization:

provider "elasticstack" {
  elasticsearch {}
  kibana {
    endpoints = ["http://localhost:5601"]
    api_key = "<REDACTED>"
  }
}

resource "elasticstack_kibana_alerting_rule" "example" {
  name        = "test-rule"
  consumer    = "alerts"
  notify_when = "onActiveAlert"
  params = jsonencode({
    timeSize = 5,
    timeUnit = "m",
    logView = {
      "type" = "log-view-reference",
      "logViewId" = "default"
    },
    count = {
      "value" = 3,
      "comparator" = "more than"
    },
    criteria = [
      {
	"field" = "response",
	"comparator" = "matches",
	"value" = "200"
      }
    ]
  })
  rule_type_id = "logs.alert.document.count"
  interval     = "1m"
  enabled      = true
}

2. TF operations to execute to get the error: terraform plan,terraform apply
3. See the error in the output:

Planning failed. Terraform encountered an error while generating this plan.

╷
│ Error: Unabled to get alerting rule
│
│   with elasticstack_kibana_alerting_rule.example,
│   on rule.tf line 26, in resource "elasticstack_kibana_alerting_rule" "example":
│   26: resource "elasticstack_kibana_alerting_rule" "example" {
│
│ Failed with: {"statusCode":401,"error":"Unauthorized","message":"Unauthorized"}

Expected behavior
The provider should display the valid plan.

Debug output

HTTP/1.1 401 Unauthorized
...
{
 "statusCode": 401,
 "error": "Unauthorized",
 "message": "[security_exception\n\tRoot causes:\n\t\tsecurity_exception: unable to authenticate with provided credentials and anonymous access is not allowed for this request]: unable to authenticate with provided credentials and anonymous access is not allowed for this request"
}

Versions (please complete the following information):

• Terraform Version 1.8.2
• Provider version main branch