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 rear perspective view thereof;
FIG. 4 is an enlarged view of the claimed region in FIG. 1, shown in isolation;
FIG. 5 is an enlarged view of the claimed region in FIG. 2, shown in isolation; and,
FIG. 6 is an enlarged view of the claimed region in FIG. 3, shown in isolation,
The broken lines immediately adjacent to the photographic area define the bounds of the claimed design and form no part thereof. The broken lines showing the remainder of the shoe represent unclaimed subject matter and form no part of the claimed design.