The ornamental design for a cartridge, as shown and described.
FIG. 1 is a perspective view of the cartridge with the left, front, and top of the cartridge visible;
FIG. 2 is a perspective view of the cartridge with the left, rear, and bottom of the cartridge visible;
FIG. 3 is a front view of the cartridge with the bottom of the cartridge oriented downward with respect to the page;
FIG. 4 is a rear view of the cartridge with the bottom of the cartridge oriented downward with respect to the page;
FIG. 5 is a view of the right side of the cartridge with the front of the cartridge oriented toward the right with respect to the figure number;
FIG. 6 is a view of the left side of the cartridge with the front of the cartridge oriented toward the left with respect to the figure number;
FIG. 7 is a view of the top side of the cartridge with the front of the cartridge oriented toward the right with respect to the figure number; and,
FIG. 8 is a view of the bottom side of the cartridge with the front of the cartridge oriented toward the right with respect to the figure number.
The dashed lines in the drawing show environment structure and form no part of the claimed design. Shading is not a part of the claimed design, but is used to illustrate surface contour.