The ornamental design for a streetlight with cable supports, as shown and described.
FIG. 1 is a perspective view of a street light with cable supports, showing the new design;
FIG. 2 is a right-side elevation view thereof;
FIG. 3 is a left-side elevation view thereof;
FIG. 4 is a back-side elevation view thereof;
FIG. 5 is a front-side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines shown represent unclaimed subject matter and form no part of the claimed design. The dot-dash-dot lines passing through the broken lines indicate that the environment of the design is not limited to a particular height.