The ornamental design for a connector, as shown and described.
FIG. 1 is a front perspective view of a connector showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevation view thereof, the rear elevation view being a mirror image thereto;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a left side elevation view thereof; and,
FIG. 6 is a right side elevation view thereof.
The surfaces are lightly lined for contour and no claim is made to contour lining. The dashed lines indicated disclaimed portions of the design, and no claim is made to the designated portions indicated by dashed lines.