The ornamental design for a faucet, as shown and described.
FIG. 1 is a perspective view of a faucet showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a right-side elevation view thereof;
FIG. 5 is a left-side elevation view thereof;
FIG. 6 is a rear elevation view thereof; and,
FIG. 7 is a front elevation view thereof.
The dash-dot-dash broken lines represent the bounds of the claim, while all other broken lines are included for the purpose of illustrating portions of the faucet; the broken lines form no part of the claimed design.