Update rust version in `lcli` Dockerfile
The `lcli` docker build was no longer working on the old rust version
# `lcli` requires the full project to be in scope, so this should be built either:
# - from the `lighthouse` dir with the command: `docker build -f ./lcli/Dockerflie .`
# - from the current directory with the command: `docker build -f ./Dockerfile ../`
-FROM rust:1.53.0 AS builder
+FROM rust:1.56.1-bullseye AS builder
RUN apt-get update && apt-get -y upgrade && apt-get install -y cmake
COPY . lighthouse
ARG PORTABLE
