ed25519-zebra 4.0.0
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upgrade curve25519-dalek to 4.0.0-rc.2
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clippy fixes
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activate ed25519/pem only when needed
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bump to 4.0.0; bump MSRV to 1.65; fix no_std support; test MSRV and no_std in CI
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use rust-toolchain instead of TOML to work with (unmaitained) actions-rs/toolchain