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 second side view thereof;
FIG. 4 is a toe end view thereof;
FIG. 5 is a heel end view thereof; and,
FIG. 6 is a top view thereof.
The photographic area represents the claim. The broken lines immediately adjacent to the photographic area define the bounds of the claimed design, and form no part thereof. The broken lines showing the remainder of the shoe are for environmental purposes only, and form no part of the claimed design.