The ornamental design for a shoe upper, as shown and described.
FIG. 1 is a front and medial side view in perspective of a shoe upper showing our new design;
FIG. 2 is a top view thereof; and,
FIG. 3 is a front and lateral side view thereof.
The broken, dot-dash lines in each of FIGS. 1-3 define the bounds of the claimed design and form no part of thereof. The broken, dashed lines FIGS. 1-3 are for environmental purposes only and form no part of the claimed design. The shoe upper illustrated in FIGS. 1-3 is a first embodiment showing a left-footed form of the shoe upper. A second embodiment for the right-footed form of the shoe upper, which is a mirror image of the left-footed form, is not illustrated.