The ornamental design for a faucet, as shown and described.
FIG. 1 is a front perspective view of a faucet showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a side elevational view thereof, the opposite side is a mirror image thereof; and,
FIG. 4 is a top plan view thereof.
The broken lines in FIGS. 1 and 4 represent portions of the faucet that form no part of the claimed design. The broken lines in FIGS. 1-4 show the environment where the claimed design resides and form no part thereof