The ornamental design for a vehicle, as shown and described.
FIG. 1 is a right front perspective view of a vehicle according to the present invention.
FIG. 2 is a left rear perspective view thereof.
FIG. 3 is a front view thereof.
FIG. 4 is a rear view thereof.
FIG. 5 is left side view thereof.
FIG. 6 is a right side view thereof; and,
FIG. 7 is a top view thereof.
Any elements shown in broken lines in the Figures form no part of the claimed invention, and are instead included to show environmental aspects of the claimed invention. Also, broken lines shown adjacent to any shaded portions form an unclaimed boundary of the design.