We claim the ornamental design for a beverage dispenser, as shown and described.
FIG. 1 is a perspective view of a beverage dispenser in accordance with our new design;
FIG. 2 is a right view thereof;
FIG. 3 is a left view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines showing portions of the beverage dispenser are for the purpose of illustrating environmental structure only and forms no part of the claimed design.