fix: use real boolean instead of aws's bool (#5313)

server/models/WebhookSubscription.ts

@@ -1,5 +1,4 @@
 import crypto from "crypto";
-import { bool } from "aws-sdk/clients/signer";
 import { isEmpty } from "lodash";
 import { SaveOptions } from "sequelize";
 import {
@@ -122,7 +121,7 @@ class WebhookSubscription extends ParanoidModel {
    * @param event Event to ceck
    * @returns true if event is valid
    */
-  public validForEvent = (event: Event): bool => {
+  public validForEvent = (event: Event): boolean => {
     if (this.events.length === 1 && this.events[0] === "*") {
       return true;
     }