arti/maint/downgrade_dependencies

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#!/usr/bin/env bash
#
# Downgrades every one of our dependencies in Cargo.lock to the
# earliest version listed in our Cargo.toml files. (And then
# re-upgrades a few second-order dependencies that aren't actually
# supported by our first-order dependencies in their oldest versions.)
#
# The purpose of this script is to make sure that we are actually
# compatible with the versions listed in our Cargo.toml files.
# Without testing this, we could wind up with code that built
# successfully with the versions listed in Cargo.lock, while declaring
# support for versions of our dependencies that won't actually work.
set -euo pipefail
cargo +nightly update -Z minimal-versions
cargo update \
-p crc32fast \
-p zeroize_derive:1.3.2 \
-p env_logger:0.5.0