Boveda packs are for long-term stable storage and curing of 'dried' herbal materials, and as such allow or even encourage microbial growth (essential for curing). They should not be used to preserve 'freshness' of sugary foods.
Processed food products are generally designed to be most stable when well sealed up, not exposed to air and humidity. You're talking about putting gummies (gelled carb solutions) exposed to air within a larger sealed container maintained at constant humidity (but with the gummies gelling agents inherently absorbing water from the air). Even if you went with the lower 58% RH Boveda packs, that is still maintaining moderately humid air, and with the sugars and carb gelling agents generally adsorbing water, the packs would likely provide humidity/water to the gummies as they suck it up from the air, with resulting microbial growth.
Like any food, theoretically being well-sealed with refrigeration or freezing (if not affecting the gummies) is best to keep them 'fresh.'