The ornamental design for a dispenser, as shown and described.
FIG. 1 is a top, front, and left isometric view of an ornamental design for a dispenser;
FIG. 2 is a front elevational view of the dispenser of FIG. 1;
FIG. 3 is a rear elevational view of the dispenser of FIG. 1;
FIG. 4 is a left side elevational view of the dispenser of FIG. 1;
FIG. 5 is a right side elevational view of the dispenser of FIG. 1; and,
FIG. 6 is a top plan view of the dispenser of FIG. 1.
The dash-dash-dash lines are included for the purpose of illustrating portions that form no part of the claimed design. Further, the oblique shade lines depict transparent or translucent surfaces or materials.