chore(deps): update rust crate ed25519-dalek to 2.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ed25519-dalek	dependencies	minor	2.0.0 -> 2.1.0

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Release Notes

dalek-cryptography/curve25519-dalek (ed25519-dalek)

### [`v2.1.0`](https://togithub.com/dalek-cryptography/curve25519-dalek/blob/HEAD/ed25519-dalek/CHANGELOG.md#210) [Compare Source](https://togithub.com/dalek-cryptography/curve25519-dalek/compare/2.0.0...2.1.0) - Add `SigningKey::to_scalar_bytes` for getting the unclamped scalar from a signing key - Loosened `signature` dependency to allow version 2.2

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