azurerm_dashboard_grafana - remove four point oh feature flag (#27329)

internal/services/dashboard/dashboard_grafana_resource.go

@@ -16,7 +16,6 @@ import (
 	"github.com/hashicorp/go-azure-helpers/resourcemanager/location"
 	"github.com/hashicorp/go-azure-sdk/resource-manager/dashboard/2023-09-01/grafanaresource"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
-	"github.com/hashicorp/terraform-provider-azurerm/internal/features"
 	"github.com/hashicorp/terraform-provider-azurerm/internal/sdk"
 	"github.com/hashicorp/terraform-provider-azurerm/internal/tf/pluginsdk"
 	"github.com/hashicorp/terraform-provider-azurerm/internal/tf/validation"
@@ -217,18 +216,6 @@ func (r DashboardGrafanaResource) Arguments() map[string]*pluginsdk.Schema {
 		},
 	}
 
-	if !features.FourPointOhBeta() {
-		arguments["grafana_major_version"] = &pluginsdk.Schema{
-			Type:     pluginsdk.TypeString,
-			Optional: true,
-			ForceNew: true,
-			Default:  "9",
-			ValidateFunc: validation.StringInSlice([]string{
-				"9", "10",
-			}, false),
-		}
-	}
-
 	return arguments
 }