This pull request was merged a couple weeks ago that subtly renders street lamps as “a simple dot with halo”. Stable versions of Carto seem to be released roughly twice a year, and this one just missed the latest cutoff (v6.1.0 was released three weeks ago). Still, if you don’t typically add street lamps because they don’t show up on e.g. Carto, now’s a good time so they show up on the next release.
For those unfamiliar with the name, Carto is the default rendering style you see at openstreetmap.org.