The ornamental design for a tray, as shown and described.
FIG. 1 is a front and top perspective view of a tray, showing my new design;
FIG. 2 is a rear and bottom perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof; and,
FIG. 9 is a perspective view thereof, shown in open condition, in environmental use.
The dashed broken lines in the figures illustrate portions of the article that form no part of the claimed design. The broken lines tongs in FIG. 9 depict environmental subject matter that form no part of the claimed design.