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 view thereof.
The broken line showing of the heel, sole, buckle, buckle holes, toe thong, portion of straps and footbed is for illustrative purposes only and forms no part of the claimed design.