ros humble doesn't seem to be supported, please mention

I cannot build the ros package on ros humble, since the headers included from `cv_bridge` and `image_geometry` are missing (the `.hpp` files in `s3li-toolkit/s3li_ros/src/stereo_disparity_node.cpp`). This seems to be because in the iron version for `vision opencv` ([repo](https://github.com/ros-perception/vision_opencv/tree/iron/image_geometry/include/image_geometry)) they switch to using `.hpp` files from `.h` files, and I'd guess your development version is jazzy or above.

As far as I can tell, the requirement of the ros version is not mentioned anywhere, so probably simply mentioning this can help others who encounter this issue (since I would have used a different ros version from the start).

as a note to others who want to check this with humble: simply switch the cv_bridge and image_geometry headers to the `.h` version in that file above. at least builds afterwards