Update curve25519-dalek requirement from =4.0.0-rc.1 to =4.0.0-rc.2

[dependabot]

Updates the requirements on curve25519-dalek to permit the latest version.

Changelog

Sourced from curve25519-dalek's changelog.

Changelog

Entries are listed in reverse chronological order per undeprecated major series.

4.x series

4.0.0

Breaking changes

• Update the MSRV from 1.41 to 1.60
• Provide SemVer policy
• Make digest an optional feature
• Make rand_core an optional feature
• Remove std feature flag
• Remove nightly feature flag
• Automatic serial backend selection between u32 and u64 over the default u32
• Backend selection is now via cfg(curve25519_dalek_backend) over additive features.
• Provide override to select u32 or u64 backend via cfg(curve25519_dalek_bits)
• Replace methods Scalar::{zero, one} with constants Scalar::{ZERO, ONE}
• Deprecate EdwardsPoint::hash_from_bytes and rename it EdwardsPoint::nonspec_map_to_curve
• Require including a new trait, use curve25519_dalek::traits::BasepointTable whenever using EdwardsBasepointTable or RistrettoBasepointTable
• Scalar::from_canonical_bytes now returns CtOption
• Scalar::is_canonical now returns Choice

Other changes

• Add precomputed-tables feature
• Update Maintenance Policies for SemVer
• Migrate documentation to docs.rs hosted
• Fix backend documentation generation
• Fix panic when Ristretto::double_and_compress_batch receives the identity point
• Remove byteorder dependency
• Update the criterion dependency to 0.4.0
• Include README.md into crate Documentation
• Update the rand_core dependency version and the rand dev-dependency version.
• Relax the zeroize dependency to ^1
• Update the edition from 2015 to 2021

3.x series

3.2.0

• Add support for getting the identity element for the Montgomery form of curve25519, which is useful in certain protocols for checking contributory behaviour in derivation of shared secrets.

... (truncated)

Commits

• c982811 chore: Release 4.0.0-rc.2 (#522)
• 99c0520 Fixes cfg with target from env (#516)
• a63e14f Use ok_or_else instead of ok_or in serde decoding (#382)
• 67b8c2e Fix error for custom targets (#510)
• See full diff in compare view

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[daxpedda]

Already checked out the changelog, this is fine!