Have it inspected at a tire and alignment shop. They will use a stethoscope for elusive squeaks that are hard to pinpoint. There may also be a service bulletin involving drilling holes in the bottoms of the lower ball joints so you can insert the grease fittings they were too cheap to install at the factory. I'm not sure which years and models that applied to.

You can also look around the control arm bushings for a reddish rust color. That is a sign of the metal sleeve working loose and squeaking. Look at the rubber to see if it's shredded and coming apart. Shock absorbers don't squeak but their lower bushings can.