The ornamental design for lace-up footwear, as shown and described.
FIG. 1 is a front perspective view of the lace-up footwear according to the design;
FIG. 2 is a rear view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom plan view thereof.
The dash-dash lines on the surface of the shoe represent stitching and form a part of the claimed design. The contrasting shading used in the drawings depicts a contrasting appearance. The dotted lines showing the sole of the shoe form no part of the claimed design.