message: fix(types): file param is optional
diff: @@ -10,7 +10,7 @@ export interface EditWebhookMessage {
  /** Embedded `rich` content */
  embeds?: Embed[] | null;
  /** The contents of the file being sent/edited */
  - file: FileContent | FileContent[];
  + file?: FileContent | FileContent[];
  /** Allowed mentions for the message */
  allowedMentions?: AllowedMentions | null;
  /** Attached files to keep */
  