The ornamental design for a shoe upper, as shown and described.
FIG. 1 is a front perspective view of a shoe upper with a transparent overlay showing my new design;
FIG. 2 is a medial view thereof;
FIG. 3 is a rear perspective view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a second front perspective view thereof;
FIG. 6 is a lateral view thereof; and,
FIG. 7 is a rear perspective view thereof.
The broken lines immediately adjacent to the shaded area represent unclaimed boundaries of the design. The broken lines showing the remainder of the shoe are for environmental purposes only and form no part of the claimed design.