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 side view thereof;
FIG. 3 is an opposite side view thereof;
FIG. 4 is a top view thereof; and,
FIG. 5 is a second front perspective view thereof.
The shaded area and the solid lines immediately adjacent to the shaded area represent the claimed design. The broken lines immediately adjacent to the shaded area define the bounds of the claimed design, and form no part thereof. The ten unshaded eyelet regions within the shaded area that are demarcated by broken lines form 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.