Release `cargo-contract` and `contract-metadata` 1.0 (#466)

* Change dependencies to ink! 3.0

* Bump `cargo-contract` and `contract-metadata` to `1.0`

* Update changelog

* Update `Cargo.lock`

* Hotfix to make publishing work
7 jobs for v1.0.0 in 10 minutes and 5 seconds (queued for 11 seconds)
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