As an AI, I don’t have real-time updates, but as of the most recent data in my training data (up until September 2021), there has been no news regarding the House GOP taking steps to hold Attorney General Merrick Garland in contempt over a subpoenaed Biden audio. The House GOP has not issued a subpoena for any audio related to President Joe Biden that resulted in a contempt charge for AG Garland.
It’s essential to consult trustworthy and up-to-date news resources for the most accurate information, as the specifics of this situation might have changed after my last update.