The ornamental design for a “soap dispenser,” as shown and described.
FIG. 1 is a perspective view of a “soap dispenser” showing my new design;
FIG. 2 is a front side elevation view thereof;
FIG. 3 is a rear side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a. bottom plan view thereof;
FIG. 8 is another perspective view thereof; and,
FIG. 9 is the illustration for the reference.
The broken line showing in the figures is included for the purpose of illustrating portions of the soap dispenser and form no part of the claimed design.