The ornamental design for footwear, as shown and described.
FIG. 1 is a perspective view of footwear, showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a side view thereof; and,
FIG. 6 is a side view thereof.
The broken line portions shown in FIGS. 1-6 illustrate unclaimed subject matter and form no part of the claimed design. The dot-dash line portions shown in FIGS. 1-6 indicate unclaimed stitching.