The ornamental design for footwear, as shown and described.
FIG. 1 is a front perspective view of footwear showing my new design;
FIG. 2 is a left side view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is a top plan view thereof.
The broken line showing of the heel, sole, heel cap, portions of the footbed, rivets, portions of the straps, and portions of the upper in the drawings shows unclaimed subject matter.