The ornamental design for a shoe upper, as shown and described.
FIG. 1 is a front and lateral side view in perspective of a shoe upper showing my new design;
FIG. 2 is a lateral side view thereof;
FIG. 3 is a medial side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a front view thereof; and,
FIG. 7 is a rear 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 stippling depicted on portions of the shoe upper in the figures represents a difference in aesthetic feature at such portions in relation to other portions of the shoe upper. For example, the stippled portions represent a material that differs from other materials forming other portions of the shoe upper depicted in the figures. The broken line illustration in the drawings is not part of the claimed design.