The ornamental design for a footwearoutsole, as shown and described.
FIG. 1 is a perspective view of a footwear outsole showing the new design;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a medial side view thereof;
FIG. 4 is a lateral side view thereof; and,
FIG. 5 is a front view thereof.
The broken lines showing the remainder of the footwear and the tread pattern are for the purpose of illustrating environmental structure and form no part of the claimed design.