I claim the ornamental design for a shopping basket, as shown and described.
FIG. 1 is a perspective view of a design of the shopping basket;
FIG. 2 is a front elevation view of the shopping basket of FIG. 1;
FIG. 3 is a rear elevation view of the shopping basket of FIG. 1 opposite the front elevation view of FIG. 2;
FIG. 4 is a first side elevation view of the shopping basket of FIG. 1; and,
FIG. 5 is a top plan view of the shopping basket of FIG. 1.
The second side elevation view of the shopping basket is a mirror image of the first side elevation view shown in FIG. 4. The bottom plan view of the shopping basket forms no part of the claimed design.