Tony Arcieri 2aade9ddcb 2021 edition upgrade; MSRV 1.56
Upgrades the edition, with changes primarily performed by
`cargo fix --edition`.

In order to keep the changes to a minimum, this doesn't include
automated idiom fixes (i.e. `cargo fix --edition-idioms`).

This is needed to unblock the edition upgrade for the RSA crate:
https://github.com/RustCrypto/RSA/pull/135
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