The ornamental design for a shoe upper, as shown and described.
FIG. 1 is a front perspective view of a shoe upper showing our new design;
FIG. 2 is a side view thereof; and,
FIG. 3 is a rear perspective view thereof.
The even-length broken lines within the shaded area represent stitching. The uneven broken lines immediately adjacent to the shaded area represent unclaimed boundaries of the design. The uneven broken lines showing the remainder of the shoe are for environmental purposes only and form no part of the claimed design.