The ornamental design for a shoe upper, as shown and described.
FIG. 1 is a front perspective view of a shoe upper showing my new design;
FIG. 2 is a side view thereof;
FIG. 3 is a rear perspective view thereof; and,
FIG. 4 is a rear view thereof.
The broken lines immediately adjacent to the photographic area represent unclaimed boundaries of the design. The lack of a line immediately adjacent to the photographic area represents a horizon of the design from the viewpoint of the corresponding figure. The broken lines showing the remainder of the shoe represent unclaimed subject matter and form no part of the claimed design.