The ornamental design for a stringlight, as shown and described.
FIG. 1 is a perspective view of a string light showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is an enlarged view of the selected portion in FIG. 1; and,
FIG. 9 is an enlarged view of the selected portion in FIG. 1.
The dot-dash broken lines encircling the enlarged detail views are for annotative purposes and form no part of the claimed design. The string light is shown with symbolic break lines in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.