The ornamental design for faucet, as shown and described.
FIG. 1 is an oblique side view of a faucet showing our new design;
FIG. 2 is an opposite-side oblique side view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a side elevational view with the opposite side a mirror image thereof;
FIG. 5 is bottom view thereof; and,
FIG. 6 is a top view thereof.
The broken lines shown in the faucet spout and on the back of the faucet are included for the purpose of illustrating a portion of the faucet that forms no part of the claimed design.