azurerm_postgresql_flexible_server - fix sku_name validation function

Author: v-yhyeo0202

internal/services/postgres/validate/flexible_server_sku_name.go

@@ -15,7 +15,7 @@ func FlexibleServerSkuName(i interface{}, k string) (warnings []string, errors [
 		return
 	}
 
-	if !regexp.MustCompile(`^((B_Standard_B((1|2|4|8|12|16|20)ms|2s))|(GP_Standard_D(((2|4|8|16|32|48|64)s_v3)|((2|4|8|16|32|48|64)ds_v4)|((2|4|8|16|32|48|64|96)ds_v5)|((2|4|8|16|32|48|64|96)ads_v5)))|(MO_Standard_E((((2|4|8|16|20|32|48|64)s)_v3)|((2|4|6|8|16|20|32|48|64)ds_v4)|((2|4|8|16|20|32|48|64|96)ds_v5)|((2|4|8|16|32|48|64|96)ads_v5))))$`).MatchString(v) {
+	if !regexp.MustCompile(`^((B_Standard_B((1|2|4|8|12|16|20)ms|2s))|(GP_Standard_D(((2|4|8|16|32|48|64)s_v3)|((2|4|8|16|32|48|64)ds_v4)|((2|4|8|16|32|48|64|96)ds_v5)|((2|4|8|16|32|48|64|96)ads_v5)|((2|4|8|16|32|48|64|96|128|192)ds_v6)|((2|4|8|16|32|48|64|96)ads_v6)))|(MO_Standard_E((((2|4|8|16|20|32|48|64)s)_v3)|((2|4|6|8|16|20|32|48|64)ds_v4)|(64ads_v4)|((2|4|8|16|20|32|48|64|96)ds_v5)|((2|4|8|16|32|48|64|96)ads_v5)|((2|4|8|16|20|32|48|64|96|128|192)ds_v6)|((2|4|8|16|20|32|48|64|96)ads_v6))))$`).MatchString(v) {
 		errors = append(errors, fmt.Errorf("%q is not a valid sku name, got %v", k, v))
 		return
 	}