The ornamental design for a faucet, as shown and described.
FIG. 1 is a top, right, front perspective view of a faucet embodying the new design;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is bottom plan view thereof.
The broken line representations of nozzle environment in FIGS. 4 and 7, and the bottom surface in FIG. 7 are for the purpose of illustration only, and form no part of the claimed design.