The ornamental design for a bucket-supporting ladder accessory, as shown and described.
FIG. 1 is a perspective view of a bucket-supporting ladder accessory
showing my new design;
FIG. 2 is a top plan view thereof; and
FIG. 3 is a bottom plan view thereof;
The broken line showing of a ladder, a paint bucket, and means to secure
the bucket-supporting ladder accessory to the ladder is for illustrative
purposes only and forms no part of the claimed design.