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 dot-dash-dot broken lines at the bottom edge and the evenly spaced broken lines forming the top edges of the shaded panels depict boundaries to the claim and form no part thereof. The evenly spaced broken line edges forming a boundary surrounding the collar illustrate portions of the jersey that are not included in the claim. All other dot-dash-dot and evenly spaced broken lines and areas of the jersey surrounding the shaded panels and collar are portions of the jersey that form no part of the claimed design. The closely spaced, smaller dash broken lines located at the bottom edge of the collar and around the sleeves depict stitching which is environment that forms no part of the claimed design.