The ornamental design for a boot-mountable light, as shown and described.
FIG. 1 is a side view in elevation of the boot-mountable light of the
present invention, with the opposite side being a mirror image, and with
the broken line showing for illustrative purposes only and forming no part
of the claimed design;
FIG. 2 is a front view in elevation of the boot-mountable light of FIG. 1;
FIG. 3 is a rear view in elevation of the boot-mountable light of FIG. 1;
FIG. 4 is a top view in elevation of the boot-mountable light of FIG. 1 as
seen from the right-hand side of FIG. 1; and,
FIG. 5 is a bottom plan view of the boot-mountable light of FIG. 1.