The ornamental design for a dispenser, as shown and described.
FIG. 1 is an isometric view of a rear, top, and left side of an ornamental design for a dispenser;
FIG. 2 is a rear elevational view of the dispenser of FIG. 1;
FIG. 3 is a front elevational view of the dispenser of FIG. 1;
FIG. 4 is a right side elevational view of the dispenser of FIG. 1, wherein the left side elevational view is a mirror image of the right side elevational view;
FIG. 5 is a top plan view of the dispenser of FIG. 1; and,
FIG. 6 is a bottom plan view of the dispenser of FIG. 1.
The broken lines are for the purpose of illustrating environmental structure and form no part of the claimed design.