I would try checking the tie rods first the best way is to have someone turn the wheel slowly left and right a 1/4 turn while you hold the outer tie rods and see if you feel the squeak through your hand . Also the Steering rack mount bushings squeak/ grunt they just need to be lubed
maybe the belt is wearing or has oil on it? usually noises like this are heard at very low speeds/low rpms. i'd try it with no belt on it as well if full of fluid and everything else checks out. or just replace the belt if it's worn anyway.
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