revert optional parameters in update

the parameters of callback provided to update can simply be empty
to represent an optional value, restricting with the optional mark prevents
authors from immediately destructuring because it can be undefined

src/runtime/action/index.ts

@@ -1,5 +1,5 @@
 export interface ActionReturn<Parameters = any> {
-	update?: (parameters?: Parameters) => void;
+	update?: (parameters: Parameters) => void;
 	destroy?: () => void;
 }