This is needed to update protobuf. Version 1.33 breaks in Go 1.16 with the following error: "//go:build comment without // +build comment". Distribution was updated from buster (10) to bookworm (12). protoc was updated from v3.6.1 to v3.21.12.
To make loop work with the latest lnd version inside of LiT, we need to upgrade the grpc-gateway library to the same v2 version here too.