The ornamental design for a dispenser, as shown and described.
FIG. 1 is a front and side perspective view of our dispenser;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
In the drawings, the stippling shown in FIGS. 1, 2, 4 and 5 indicates a contrast in appearance. The broken lines shown in the drawings depict unclaimed subject matter only, and form no part of the claimed design.