Release `cargo-contract` v0.16.0 and `metadata` v0.5.0
Created by: cmichi
Follow-up to https://github.com/paritytech/ink/pull/1043.
CI fails because we haven't published the new ink! rc yet.
Created by: cmichi
Follow-up to https://github.com/paritytech/ink/pull/1043.
CI fails because we haven't published the new ink! rc yet.