The ornamental design for a faucet, as shown and described.
FIG. 1 is a front, right side, top perspective view of a faucet showing my new design;
FIG. 2 is a rear, left side, bottom perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines represent portions of the faucet that form no part of the claimed design; the broken lines immediately adjacent shaded surfaces represent claim boundaries forming no part of the claimed design.