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 front elevational view thereof.
FIG. 3 is a rear elevational view thereof.
FIG. 4 is a first side elevational view thereof.
FIG. 5 is a second side elevational view thereof; and,
FIG. 6 is a top plan view thereof.
The broken lines on the shoe upper illustrate portions of the shoe upper that form no part of the claimed design. The broken lines in the figures depicting a sole of a shoe are for the purpose of illustrating environment and form no part of the claimed design.