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Upgrade the MSRV to 1.66.1: 1.66.0 was released two years ago on 15th of December 2022, and 1.66.1 is a point version released on the 10th of January 2023, only as a fix for a CVE.
Upgrade dependencies to the latest version that supports Rust v1.66.1: enum_variant_type wasn't upgraded as it will stop us from making sure that ::core is used in macros.
Remove unused dependencies: Bitflags wasn't used in the strum_tests crate.
Specify some options in the Cargo.toml files, such as the resolver version (set to 2), and the rust-version(s) for the included crates (set to 1.66.1).