The ornamental design for a shoe upper, as shown and described.
FIG. 1 is a perspective view of a shoe upper showing our new design;
FIG. 2 is a top plan view in elevation thereof;
FIG. 3 is a left side view in elevation thereof;
FIG. 4 is a right side view in elevation thereof; and,
FIG. 5 is a front view in elevation thereof.
The broken line illustration of environmental structure in the drawings is not part of the claimed design. The dash-dot line, which defines the bounds of the claimed design, form no part thereof