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; and,
FIG. 3 is a rear perspective view thereof.
The even-length broken lines within the shaded area depict a feature that forms no part of the claimed design. The uneven-length broken lines immediately adjacent to the shaded area define the bounds of the claimed design, and form no part thereof. The four unshaded eyelet regions within the shaded area that are demarcated by uneven-length broken lines 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.