The ornamental design for a shoe sole, as shown and described.
FIG. 1 is a right side view of a shoe sole showing my new design;
FIG. 2 is a left side view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a top view thereof.
The portions in the drawings illustrated in broken lines are directed to boundaries of the invention and form no part of the claimed design.