The ornamental design for a swinggate, as shown and described.
FIG. 1 is a perspective view of the swing gate showing the new design;
FIG. 2 is a right profile view of FIG. 1;
FIG. 3 is a left profile view of FIG. 1;
FIG. 4 is a rear view of FIG. 1;
FIG. 5 is a front view of FIG. 1;
FIG. 6 is a top view of FIG. 1; and,
FIG. 7 is a bottom view of FIG. 1.
The broken lines depict portions of the swing gate that form no part of the claimed design. The drawings contain a symbolic break. The portion between the break lines forms no part of the claimed design. The shade lines shown represent surface shading and not surface ornamentation, color, or material type.