Update curve25519-dalek requirement from 1.2.3 to 3.1.0

[dependabot-preview[bot]]

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

Changelog

Sourced from curve25519-dalek's changelog.

3.1.0

• Add support for the Elligator2 encoding for Edwards points.
• Add two optional formally-verified field arithmetic backends which use the Fiat Crypto project's Rust code, which is generated from proofs of functional correctness checked by the Coq theorem proving system.
• Add support for additional sizes of precomputed tables for basepoint scalar multiplication.
• Fix an unused import.
• Add support for using the zeroize traits with all point types. Note that points are not automatically zeroized on Drop, but that consumers of curve25519-dalek should call these methods manually when needed.

3.0.2

• Fixes to make using alloc+no_std possible for stable Rust.

3.0.1

• Update the optional packed-simd dependency to rely on a newer, maintained version of the packed-simd-2 crate.

3.0.0

• Update the digest dependency to 0.9. This requires a major version because the digest traits are part of the public API, but there are otherwise no changes to the API.

2.x series

2.1.2

• Fixes to make using alloc+no_std possible for stable Rust.

2.1.1

• Update the optional packed-simd dependency to rely on a newer, maintained version of the packed-simd-2 crate.

2.1.0

• Make Scalar::from_bits a const fn, allowing its use in const contexts.

2.0.0

• Fix a data modeling error in the serde feature pointed out by Trevor Perrin which caused points and scalars to be serialized with length fields rather than as fixed-size 32-byte arrays. This is a breaking change, but it fixes

... (truncated)

Commits

• 2ea17d5 Update CHANGELOG and README; bump to 3.1.0.
• 5eca140 Merge pull request #351 from isislovecruft/fix/cleanup-elligator
• cecc821 Merge pull request #342 from huitseeker/fiat4_with_u32
• 35d4eab Merge pull request #349 from huitseeker/modernize_benchmarks
• b05feec Merge pull request #350 from isislovecruft/develop
• 0da8f08 Maintain legacy 3.x support for lookup tables.
• ee90202 Trivial cleanups to Elligator2 encoding.
• d130b5f [benchmarks-only] Updates the benchmarks
• cc0c444 Merge branch 'feature/dynamic-table-sizes' into develop
• 1491f0d Update copyright years.
• Additional commits viewable in compare view

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