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Bump oldest rustc for preserve_order feature to 1.56.1
Required by 2021 edition in hashbrown. error: failed to download `hashbrown v0.12.1` Caused by: unable to get packages from source Caused by: failed to parse manifest at github.com-1ecc6299db9ec823/hashbrown-0.12.1/Cargo.toml Caused by: failed to parse the `edition` key Caused by: this version of Cargo is older than the `2021` edition, and only supports `2015` and `2018` editions.
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