The ornamental design for footwear, as shown and described.
FIG. 1 is a front right perspective view of the footwear showing new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is right side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a back elevation view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines of uneven length represent the boundary of the claimed design and form no part of the claimed design. The broken lines of even length on the interior of the footwear represent unclaimed structure and form no part of the claimed design.