The ornamental design for a tray, as shown and described.
FIG. 1 is a top perspective view of a tray showing our new design;
FIG. 2 is a left elevational view thereof;
FIG. 3 is a right elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a back elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The concentric broken lines and the areas within them on the interior of the top and bottom of the tray depict portions of the tray that from no part of the claimed design. The broken-line-drawn sides and the broken-line-drawn triangular corners of the tray located outside the boundaries created by the solid lines and solid contour and shading lines are not included in the claim. All broken lines form no part of the claimed design.