The ornamental design of a downspoutstake, as shown and described.
FIG. 1 is an isometric view of a first embodiment of a downspout stake incorporating my new design, wherein the portions illustrated in dotted lines form no part of the claimed design;
FIG. 2 is a front elevation view thereof; the rear elevation being a mirror image thereof;
FIG. 3 is a right side elevation view thereof, the left side elevation view being a mirror image thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
The broken line in the figures represents the bounds of the claimed design, while all other dotted lines are directed to environment and are for illustrative purposes only. None of the broken or dotted lines form part of the claimed design.