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 a front view thereof;
FIG. 4 is an opposite side view thereof; and,
FIG. 5 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 eight unshaded regions within the shaded area that are demarcated by uneven-length broken lines form no part of the claimed design. The contrast in shading represents a contrast in appearance only and does not represent any particular color, material, texture or finish. The even-length broken line within the shaded area represents stitching that forms 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.