The ornamental design for a bootanklepanel, as shown and described.
FIG. 1 is first side elevational view of a boot ankle panel embodying my new design.
FIG. 2 is the opposite side elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a perspective view thereof looking from above and the rear on the first side; and,
FIG. 5 is a perspective view thereof looking from above and the rear on the opposite side.
The outline of a boot in broken lines shows the environment in which the panel of the claimed design is located and forms no part of the claimed design.