The ornamental design for a dispenser, as shown and described.
FIG. 1 is a top, front, right perspective view of a dispenser showing our new design;
FIG. 2 is a front view thereof; and,
FIG. 3 is an enlarged view of FIG. 1 with most of the broken line subject matter removed for ease of illustration.
The uneven-length broken lines represent unclaimed boundaries of the claimed design. The even-length broken lines showing the remainder of the dispenser are for environmental purposes only and form no part of the claimed design.