Q: Is there anything that will keep the neighborhood cats out of my raised beds?

A: I think a well-aimed motion-activated sprinkler would send the cats skedaddling.

Look online for the Contech Scarecrow Motion Activated Sprinkler (click for sources) or the Havahart Spray Away Motion Activated Sprinkler (click for sources).

The cats will be deterred by the blast of water these gadgets emit.