[ci] Remove protobuf pin to < 4 (repeat) (#29584)
[ci] Remove protobuf pin to < 4 (repeat) (#29584)

#29224 removed the protobuf upper bound but #29375 was oroginally created on an older requirements file and accidentally reverted the update for unix builds.

Signed-off-by: Kai Fricke <31ea678c44dc4e8e22ccfd165592dd71a30e46ae@anyscale.com>
ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray