The ornamental design for a shoe upper, as shown and described.
FIG. 1 is a front perspective view of a shoe upper from one side showing our new design;
FIG. 2 is a front view thereof; and,
FIG. 3 is a front perspective view taken from the other side thereof.
The even-length broken lines within the shaded area represent stitching which forms part of the claimed design. The uneven-length broken line immediately adjacent to the bottom of the shaded area represents an unclaimed boundary of the design. The uneven-length broken lines showing the remainder of the shoe represent environment and form no part of the claimed design.