Can you use blond hair dye to lighten your dark brown hair?

No. A color that is lighter cannot "cover" a darker color. A blonde color can possibly lift some pink out of the hair, depending on the level of lift/strength of the peroxide. Your best bet is to color your hair a darker color to cover the pink, or go to a salon for color correction. Using a store-bought blonde over pink will most likely only cause damage and turn the hair either a lighter pink, or some really ugly color. I would not suggest it under any circumstances.