message: ref(nextjs): Remove object.freeze call
  Save on bytes by removing object.freeze.
diff: @@ -8,9 +8,9 @@ const global = getGlobalObject<Window>();
  type StartTransactionCb = (context: TransactionContext) => Transaction | undefined;
  -const DEFAULT_TAGS = Object.freeze({
  +const DEFAULT_TAGS = {
  'routing.instrumentation': 'next-router',
  -});
  +} as const;
  let activeTransaction: Transaction | undefined = undefined;
  let prevTransactionName: string | undefined = undefined;
  