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 second front perspective view thereof;
FIG. 3 is a side view thereof;
FIG. 4 is a second side view thereof;
FIG. 5 is a front view thereof; and,
FIG. 6 is a top view thereof.
The uneven-length broken lines immediately adjacent to the shaded area define the bounds of the claimed design and form no part thereof. The even-length broken lines within the shaded area represent stitching that forms no part of the claimed design. The uneven-length arcuate broken lines within the shaded area represent eyelets that form no part of the claimed design. The uneven-length broken lines showing the remainder of the shoe are for environmental purposes only and form no part of the claimed design.