The ornamental design for a latch, as shown and described.
FIG. 1 is a top, front, and right side perspective view of a latch according to my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is bottom plan view thereof.
The dot-dash broken lines represent boundaries of the claimed design and form no part of the claimed design. The dash-dash broken lines depict portions of the latch that form no part of the claimed design.