(Reuters) – The United States government has sent out over 25 million of the updated COVID-19 booster shots, mostly from Pfizer/BioNTech, as production of the Moderna shot continues to ramp up, a federal health agency said on Tuesday. Some U.S. pharmacies like CVS Health and Walgreens Boots Alliance also reported on Tuesday that government supply of Moderna’s updated shot remains limited, causing appointments for the product to vary across the country. Both CVS and Walgreens said they are working with the government to acquire more Moderna doses and have not seen any supply issues for the Pfiz…