Yes, cat litter is (usually) a form of montmorillonite clay, which is good at absorbing damp.
To remove the last traces of damp, a large flat dish of table salt does the trick too, but first you have to remove the bulk of the water as suggested above.
We had a bulkhead leak on an old Vectra, which was impossible to dry out without removing the carpets. Best bet might be to remove the carpets completely and dry them indoors, meanwhile put a caravan dehumidifer (i.e. a large box of silica gel) in the passenger footwell whenever the car is parked up.
Once the gel (or salt dish) stop absorbing any more water, and the carpets are completely dry, then its time to reinstall them in the car. Or else replace them with a new set if you can pick them up at reasonable cost?
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