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As part of upgrading syn to 2.0 (e.g., https://github.com/tokio-rs/tracing/pull/2516), we need to bump the MSRV to 1.56. As part of this PR, I've: - Updated the text descriptions of what would be an in-policy MSRV bump to use more recent versions of rustc. The _niceness_ of said version numbers are purely coincidental. - I've removed some of the exceptions made in CI.yml in order to support some crates with a higher MSRV.