types(Webhook): More accurate type for sourceChannel (#6751)

src/structures/Webhook.js

@@ -98,7 +98,7 @@ class Webhook {
     if ('source_channel' in data) {
       /**
        * The source channel of the webhook
-       * @type {?(Channel|APIChannel)}
+       * @type {?(NewsChannel|APIChannel)}
        */
       this.sourceChannel = this.client.channels?.resolve(data.source_channel?.id) ?? data.source_channel;
     } else {

typings/index.d.ts

@@ -2135,7 +2135,7 @@ export class Webhook extends WebhookMixin() {
   public name: string;
   public owner: User | APIUser | null;
   public sourceGuild: Guild | APIPartialGuild | null;
-  public sourceChannel: Channel | APIPartialChannel | null;
+  public sourceChannel: NewsChannel | APIPartialChannel | null;
   public token: string | null;
   public type: WebhookType;
 }