The ornamental design for a vendingkiosk, as shown and described.
FIG. 1 is a front, left side perspective view showing my new design for the vending kiosk.
FIG. 2 is a front view of thereof.
FIG. 3 is a left side view thereof, the right side thereof being a mirror image; and,
FIG. 4 is a top view thereof.
The broken lines indicate unclaimed portions and form no part of the claimed design. The bottom and rear surfaces do not form part of the claimed design.