azurerm_monitor_action_group - acctest: fix webhook.service_uri

[teowa]

origin failure:

------- Stdout: -------
=== RUN   TestAccMonitorActionGroup_multipleReceiversUpdate
=== PAUSE TestAccMonitorActionGroup_multipleReceiversUpdate
=== CONT  TestAccMonitorActionGroup_multipleReceiversUpdate
    testcase.go:113: Step 3/6 error: Error running apply: exit status 1
        Error: creating or updating Action Group (Subscription: "*******"
        Resource Group Name: "acctestRG-230907011804771339"
        Action Group Name: "acctestActionGroup-230907011804771339"): actiongroupsapis.ActionGroupsAPIsClient#ActionGroupsCreateOrUpdate: Failure responding to request: StatusCode=400 -- Original Error: autorest/azure: Service returned an error. Status=400 Code="WebhookServiceUriBlocked" Message="WebhookServiceUriBlocked"
          with azurerm_monitor_action_group.test,
          on terraform_plugin_test.tf line 36, in resource "azurerm_monitor_action_group" "test":
          36: resource "azurerm_monitor_action_group" "test" {
--- FAIL: TestAccMonitorActionGroup_multipleReceiversUpdate (327.71s)
FAIL

[catriona-m]

Thanks @teowa LGTM!

[github-actions]

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