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;
FIG. 3 is a second side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is a top view thereof.
The long-short-long dash broken line immediately adjacent to the shaded area represents unclaimed boundaries of the design. The even length broken line showing of shoelace hooks represents portions of the shoe upper that form no part of the claimed design. The long-short-long dash broken line showing the remainder of the shoe represents environmental subject matter and forms no part of the claimed design.