The ornamental design for a jersey, as shown and described.
FIG. 1 is a front view of a jersey; and,
FIG. 2 is a rear view of the jersey of FIG. 1.
The broken lines with more closely spaced and smaller dashes located near the collar, the lower ends of the sleeves, and the lower edge of the jersey represent stitching and are directed to environment that forms no part of the claimed design. The broken lines surrounding the collar represent the boundaries of the collar feature of the claimed design and are not claimed. The evenly-spaced broken lines in the drawings depict portions of the article that are not included in the claim. The areas adjacent to the shaded areas are portions of the jersey that form no part of the claimed design.