The ornamental design for a receptacle, as shown and described.
FIG. 1 is a perspective view of a receptacle showing our new design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a left side elevation view thereof, the right side being a mirror image; and,
FIG. 5 is a top plan view thereof.
The broken lines immediately adjacent shaded areas represent bounds of the claimed design and environment while all other broken lines are directed to environment and are for illustrative purposes only. The broken lines form no part of the claimed design.