Update CHANGELOG.md hashicorp#27440

CHANGELOG.md

@@ -17,6 +17,7 @@ ENHANCEMENTS:
 * Dependencies - update `go-azure-sdk` to `v0.20241021.1074254` [GH-27713]
 * `newrelic` - upgrade api version to `2024-03-01`  [GH-27135]
 * `cosmosdb` - upgrade api version to `2024-08-15` [GH-27659]
+* `azurerm_application_gateway` - support for the new `Basic` SKU value [GH-27440]
 * `azurerm_consumption_budget_management_group` - the property `notification.threshold_type` can now be updated [GH-27511]
 * `azurerm_consumption_budget_resource_group` - the property `notification.threshold_type` can now be updated [GH-27511]
 * `azurerm_container_app` - add support for the `template.container.readiness_probe.initial_delay` and `template.container.startup_probe.initial_delay` properties [GH-27551]