message: fix(handlers): non-null-assert payload.id in THREAD_MEMBER_UPDATE
diff: @@ -6,7 +6,8 @@ import { snowflakeToBigint } from "../../util/bigint.ts";
  export async function handleThreadMemberUpdate(data: DiscordGatewayPayload) {
  const payload = data.d as ThreadMember;
  - const thread = await cacheHandlers.get("channels", snowflakeToBigint(payload.id));
  + // The id field is omitted from the thread member dispoatched within the GUILD_CREATE gateway event.
  + const thread = await cacheHandlers.get("channels", snowflakeToBigint(payload.id!));
  if (!thread) return;
  thread.member = payload;
  