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.
A photographic area is shown in the Figures. The broken lines immediately adjacent to the photographic area represent unclaimed boundaries of the design. The lack of a broken or solid line immediately adjacent to the photographic area indicates a claimed edge of the design. The 4 eyelet regions within the photographic area, 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.