The ornamental design for a connector, as shown and described.
FIG. 1 is a front bottom perspective view of a connector showing our new design;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a front view thereof;
FIG. 7 is a rear view thereof; and,
FIG. 8 is a front top perspective view thereof.
The uneven-length broken line immediately adjacent to and surrounding the shaded area defines the bounds of the claimed design and forms no part thereof. The even-length broken lines depicting the remainder of the connector form no part of the claimed design.