We claim the ornamental design for a toner cartridge, as shown and described.
FIG. 1 is a front view of our new design for a toner cartridge;
FIG. 2 is a rear view thereof;
FIG. 3 is a right-side view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a top perspective view thereof; and,
FIG. 8 is a bottom perspective view thereof.
The broken lines immediately adjacent to the shaded areas depict the bounds of the claimed design, while all other broken lines are directed to environment. The broken lines form no part of the claimed design. The wire frame lines shown throughout the views are intended to indicate surface contour.