The ornamental design for a shoe upper, as shown and described.
FIG. 1 is a front lateral perspective view 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 front view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is a top view thereof.
The broken lines immediately adjacent to the shaded area define the bounds of the claimed design and form no part thereof. The unshaded area within the interior of the collar feature 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.