The ornamental design for a deckskirt, as shown and described.
FIG. 1 is a perspective view of a deck skirt of my new design;
FIG. 2 is a magnified view of area 2 as shown in FIG. 1;
FIG. 3 is a front view of the deck skirt as illustrated in FIG. 1;
FIG. 4 is a back view of the deck skirt as illustrated in FIG. 1;
FIG. 5 is a left side view of the deck skirt as illustrated in FIG. 1; and,
FIG. 6 is a right side view of the deck skirt as illustrated in FIG. 1.
The subject matter shown in broken lines does not constitute any part of the claimed design. The evenly spaced broken lines depict portions of the deck skirt that form no part of the claimed design. The unevenly spaced broken lines depict the limits of the enlarged view. The break lines in the figures represent the bounds of the Claim.