The ornamental design for a faucet, as shown and described.
FIG. 1 is a perspective view of a faucet;
FIG. 2 is a front view of the faucet of FIG. 1;
FIG. 3 is a rear view of the faucet of FIG. 1;
FIG. 4 is a right side view of the faucet of FIG. 1;
FIG. 5 is a left side view of the faucet of FIG. 1;
FIG. 6 is a top plan view of the faucet of FIG. 1; and,
FIG. 7 is a bottom plan view of the faucet of FIG. 1.
The broken lines shown in the drawing are for the purpose of illustrating interior structures and environment that may be included in the faucet and form no part of the claimed design.