The Argenziano School at Lincoln Park has received a $5,000 grant from the Laura Bush Foundation. The Somerville School Department says the funding will be used to expand and diversify the school’s library collection. The Argenziano was one of four schools in the state to receive a portion of the more than $1.1 million the foundation distributed nationwide. The school said it plans to buy a collection of graphic novels and a selection of nonfiction.