The ornamental design for a shoe upper, as shown and described.
FIG. 1 is a lateral and front view in perspective of a shoe upper showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a lateral side view thereof;
FIG. 5 is a medial side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The shoe upper illustrated is a first embodiment showing a right-footed form of the shoe upper. A second embodiment is for the left-footed form of the shoe upper, which is a mirror image of the right-footed form, is not illustrated. The broken line illustration in the drawings is not part of the claimed design. The stippled areas of the shoe illustrate a contrast in appearance.