The ornamental design for a housekeepingcart, as shown and described.
FIG. 1 is a top left isometric view of a housekeeping cart showing our new design;
FIG. 2 is a left side view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a top right isometric view thereof.
The broken lines shown in the figures are included for the purpose of illustrating portions of the housekeeping cart and form no part of the claimed design.