FIG. 1 is a perspective view of the footwear upper embodying the new design; FIG. 2 is a top plan view thereof; FIG. 3 is a right side elevational view thereof; FIG. 4 is a left side elevational view thereof; FIG. 5 is a front elevational view thereof; and, FIG. 6 is a rear elevational view thereof. FIGS. 1-6 show an outsole in broken lines. The outsole is shown for environmental purposes and does not form any part of the claimed design.