The ornamental design for a vehicle, as shown and described.
FIG. 1 is a left, front perspective view of a vehicle showing my new design;
FIG. 2 is a right, rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof; and,
FIG. 7 is a top view thereof.
The portions of the vehicle shown throughout the drawing views in broken lines are for environmental and illustrative purposes and form no part of the claimed design.