The ornamental design for a gate latch, as shown and described.
FIG. 1 is a top, front, and left side perspective view of a gate latch
showing my new design, the broken-line depiction of portions of the gate
being for illustrative purposes only and forming no part of the claimed
design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a top plan view thereof, the bottom being a mirror image of that
shown;
FIG. 4 is a right side elevational view thereof; and