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 an opposite side view thereof;
FIG. 4 is a front view thereof; and,
FIG. 5 is a top view thereof.
The uneven-length broken lines immediately adjacent to the shaded area represent unclaimed boundaries of the design. The even-length broken lines within the shaded area represent stitching that forms no part of the claimed design. The uneven-length broken lines showing the remainder of the shoe represent unclaimed subject matter and form no part of the claimed design. The 16 unshaded eyelet regions within the shaded area form no part of the claimed design.