The ornamental design for a shoe upper, as shown and described.
FIG. 1 is a perspective view of knit shoe upper in accordance with my new design.
FIG. 2 is a left side view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a rear view thereof; and,
FIG. 7 is a front view thereof.
The broken lines shown in the drawings represent portions of the shoe upper, midsole periphery and outsole bottom that form no part of the claimed design. The cross-hatched shading in FIGS. 1, 2, 3, 4, 6 and 7 represents a knit material that forms the footwear upper.