move to rust 2021

[nuke-web3]

No description provided.

[nuke-web3]

MSRV is The "minimum supported Rust version" right?

"increments are a breaking Semver change" policy may applies to this repository 🤔 should it?

The relevant check should update to the minimal dependency versions first, in order to make sure newer compatible versions are ignored in this regard.

AFAIK minimal stable toolchain version with rust edition 2021 is rustc 1.56.0
https://blog.rust-lang.org/2021/10/21/Rust-1.56.0.html

This could be propagated in all change logs and maybe include a version bump. But what type? patch, minor or major?
Or no bump?

[athei]

paritytech/parity-wasm#322 (comment)

[nuke-web3]

rust-version = "1.56.1" introduced

For reference, I tried to get this to cargo build with 1.56.0 and it failed with

error: package `...` cannot be built because it requires rustc 1.56.1 or newer, while the currently active rustc version is 1.56.0

With --ignore-rust-version it does build with 1.56.0, as expected.