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;
FIG. 4 is a front perspective view of a second embodiment of a shoe upper showing my new design;
FIG. 5 is a side view thereof; and,
FIG. 6 is a rear perspective view thereof.
The broken line immediately adjacent to the bottom of the shaded area defines the bounds of the claimed design, and forms no part thereof. The broken line showing of a circular eyelet in FIGS. 1-3 represents subject matter that forms no part of the claimed design. The broken lines showing the remainder of the shoe are for environmental purposes only and form no part of the claimed design.