The ornamental design for three-hole deck-mount faucet, as shown and described.
FIG. 1 is a perspective view of the three-hole deck-mount faucet according to the invention, the surrounding deck that is not part of the invention being indicated in dashed lines;
FIG. 2 is a left-side elevation view of the faucet;
FIG. 3 is a right-side elevation view of the faucet;