The ornamental design for a vehicle, as shown and described.
FIG. 1 is a rear perspective view of a vehicle showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a side elevational view thereof, the opposite side view being a mirror image of that side shown;
FIG. 5 is top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The portions of the vehicle shown in broken lines shown throughout the drawing are for environmental purposes only and form no part of the claimed design.