The ornamental design for a utilitytray, as shown and described.
FIG. 1 is a left isometric view of the utility tray showing our new design;
FIG. 2 is a right isometric view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a grouped view thereof.
The broken line showing of stacked trays and a tray holder is included for the purpose of showing the environment of the utility tray and forms no part of the claimed design.