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 lateral side view thereof;
FIG. 3 is a medial side view thereof;
FIG. 4 is a rear lateral perspective view thereof;
FIG. 5 is a rear medial perspective view thereof; and,
FIG. 6 is a front view thereof.
The broken lines immediately adjacent to the shaded area define the bounds of the claimed design, and form no part thereof. The broken lines extending through the circular regions within the claimed design represent lacing elements, and form no part of the claimed design. The even-length broken lines within the claimed design represent material seams, and form no part of the claimed. The broken lines showing the remainder of the shoe are for environmental purposes only and form no part of the claimed design.