The ornamental design for the jeans, as shown and described.
FIG. 1 is a front perspective view of the jeans.
FIG. 2 is a front view of the jeans.
FIG. 3 is a rear view of the jeans.
FIG. 4 is a right side view of the jeans.
FIG. 5 is left side plan view of the jeans; and,
FIG. 6 is a reduced front view of the jeans; the broken lines representing portions of the human form show the jeans being worn and form no part of the claimed design.
The broken lines, shown throughout the views on the surface of the jeans, represent stitching.