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